B. Network and Sharing Center

C. Disclose the experience via social media.

A. Network & Internet

D. Quarantine the system.

A. Rootkit

Answer DescriptionExplanation: A rootkit (Option A) is a type of malware designed to gain administrative (root) access to a system while hiding its presence. Rootkits can manipulate system processes and files to remain undetected, making them particularly dangerous.
Trojan (Option B) is malware disguised as legitimate software but doesn't necessarily provide administrative access.
Worm (Option C) spreads across networks but doesn't grant administrative access. Ransomware (Option D) encrypts data and demands a ransom but doesn't typically provide ongoing administrative access.
CompTIA A+ Core 2 References: 2.3 - Explain malware types, including rootkits and their purpose .

D. Move factory applications to external memory.

Answer DescriptionExplanation: The best way to resolve the issue is to move factory applications to external memory. This will free up some space on the phone’s internal storage, which is required for updating the phone. To do this, you can follow these steps1:
Insert a microSD card into your phone if you don’t have one already.
Go to Settings > Apps and tap on the app you want to move.
Tap on Storage and then on Change.
Select the SD card option and tap on Move.
You may need to repeat this process for multiple apps until you have enough space to update your phone. Alternatively, you can also clear the cache and data of some apps, or uninstall the apps that you don’t use frequently. You can find more information on how to fix insufficient storage error on your phone in these articles234. I hope this helps.

B. Back up the files and do a system restore.

Answer DescriptionExplanation: The best course of action for the technician is to restore the defaults and reimage the corporate OS on the device. This will remove the jailbreak and any unauthorized or malicious apps that may have been installed on the device, as well as restore the security features and policies that the company has set for its devices. This will also ensure that the device can receive the latest updates and patches from the manufacturer and the company, and prevent any data leakage or compromise from the device.
Jailbreaking is a process of bypassing the built-in security features of a device to install software other than what the manufacturer has made available for that device1. Jailbreaking allows the device owner to gain full access to the root of the operating system and access all the features1. However, jailbreaking also exposes the device to various risks, such as:
The loss of warranty from the device manufacturers2.
Inability to update software until a jailbroken version becomes available2. Increased security vulnerabilities32.
Decreased battery life2. Increased volatility of the device2.
Some of the signs of a jailbroken device are:
A high number of ads, which may indicate the presence of adware or spyware on the device3. Receiving data-usage limit notifications, which may indicate the device is sending or receiving data in the background without the user’s knowledge or consent3.
Experiencing slow response, which may indicate the device is running unauthorized or malicious apps that consume resources or interfere with the normal functioning of the device3.
Finding apps or icons that the user did not install or recognize, such as Cydia, which is a storefront for jailbroken iOS devices1.
The other options are not sufficient or appropriate for dealing with a jailbroken device. Running an antivirus and enabling encryption may not detect or remove all the threats or vulnerabilities that the jailbreak has introduced, and may not restore the device to its original state or functionality. Backing up the files and doing a system restore may not erase the jailbreak or the unauthorized apps, and may also backup the infected or compromised files. Undoing the jailbreak and enabling an antivirus may not be possible or effective, as the jailbreak may prevent the device from updating or installing security software, and may also leave traces of the jailbreak or the unauthorized apps on the device.

B. Rootkit

Answer DescriptionExplanation: Rootkits are particularly dangerous because they modify the operating system to hide their presence and can disable antivirus software like Windows Defender. Ransomware (A) encrypts files, but usually does not disable antivirus software. Spyware (C) and Keyloggers (D) typically do not directly disable antivirus programs either. Reference: Core 2, Domain 2.3 - Malware types and impacts.