Explanation
With cloud providers hosting a number of different customers, it would be impractical for them to pursue additional certifications based on the needs of a specific customer. Cloud environments are built to a common denominator to serve the greatest number of customers, and especially within a public cloud model, it is not possible or practical for a cloud provider to alter their services for specific customer demands.

Explanation
The following groups form the key roles and functions associated with cloud computing. They do not constitute an exhaustive list but highlight the main roles and functions within cloud computing:
- Cloud customer: An individual or entity that utilizes or subscribes to cloud based services or resources.
- CSP: A company that provides cloud-based platform, infrastructure, application, or storage services to other organizations or individuals, usually for a fee; otherwise known to clients "as a service.
- Cloud backup service provider: A third-party entity that manages and holds operational responsibilities for cloud-based data backup services and solutions to customers from a central data center.
- CSB: Typically a third-party entity or company that looks to extend or enhance value to multiple customers of cloud-based services through relationships with multiple CSPs. It acts as a liaison between cloud services customers and CSPs, selecting the best provider for each customer and monitoring the services. The CSB can be utilized as a "middleman" to broker the best deal and customize services to the customer's requirements.
May also resell cloud services.
- Cloud service auditor: Third-party organization that verifies attainment of SLAs.

Forensics refers to the application of scientific methods and protocols to the investigation of crimes. Although forensics has traditionally been applied to well-known criminal proceedings and investigations, the term equally applies to digital investigations and methods. Although the other answers provide similar-sounding terms and ideas, none is the appropriate answer in this case.

Explanation
Disaster recovery and business continuity are vital concerns with availability. If data is destroyed or compromised, having regular backup systems in place as well as being able to perform disaster recovery in the event of a major or widespread problem allows operations to continue with an acceptable loss of time and data to management. This also ensures that sensitive data is protected and persisted in the event of the loss or corruption of data systems or physical storage systems.