D.

Reversibility

Explanation:
Reversibility is the cloud concept involving the ability for a cloud customer to remove all of its data and IT assets from a cloud provider. Also, processes and agreements would be in place with the cloud provider that ensure all removals have been completed fully within the agreed upon timeframe. Portability refers to the ability to easily move between different cloud providers and not be locked into a specific one. Removability and extraction are both provided as terms similar to reversibility, but neither is the official term or concept.

B.

Avoiding vendor lock-in/lockout

A.

Third-party identity broker

C.

Portability

Explanation:
Portability is the ability for a cloud customer to easily move their systems, services, and applications among different cloud providers. By avoiding reliance on proprietary APIs and other vendor-specific cloud features, an organization can maintain flexibility to move among the various cloud providers with greater ease. Reversibility refers to the ability for a cloud customer to quickly and easy remove all their services and data from a cloud provider. Interoperability is the ability to reuse services and components for other applications and uses. Scalability refers to the ability of a cloud environment to add or remove resources to meet current demands

D.

Change management

Explanation:
The change management process involves the creation of the official Request for Change (RFC) ticket, which is used to document the change, obtain the required approvals from management and stakeholders, and track the change to completion. Release management is a subcomponent of change management, where the actual code or configuration change is put into place. Deployment management is similar to release management, but it's where changes are actually implemented on systems. Problem management is focused on the identification and mitigation of known problems and deficiencies before they are able to occur.

D.

Line conditioning

Explanation:
A UPS can provide line conditioning, adjusting power so that it is optimized for the devices it serves and smoothing any power fluctuations; it does not offer any of the other listed functions

D.

Usefulness

Explanation:When we gather information about business requirements, we need to do a complete inventory, receive accurate valuation of assets (usually from the owners of those assets), and assess criticality; this collection of information does not tell us, objectively, how useful an asset is, however.

B.

A runtime state