Similarly, organizations should strive to avoid vendor lock-in whenever possible. Portability is a design principle that says workloads should be designed so that they don't leverage vendor-specific features and may be more easily shifted between cloud providers. This isn't always possible, but it is a good design practice.
(ISC)2 CCSP Certified Cloud Security Professional Official Study Guide (p. 22).
Interoperability defines how easy it is to move and reuse application components regardless of the provider, platform, OS, infrastructure, location, storage, format of data or APIs,
how well applications work together, and how well new applications work with other
solutions present in the business, organization, or provider’s existing architecture.
The question is about "moving between cloud providers" (portability) and not retrieve&delete data from a cloud provider (reversibility) nor the ability for apps to work seamlessly with providers (interoperability).
Its Portability. From CCSP Students Guide: Portability defines the ease with which application components are
moved and reused elsewhere regardless of the provider, platform,
OS, infrastructure, location, storage, format of data, or APIs.
Portability is a key aspect to consider when selecting cloud
providers, since it can both help prevent vendor lock-in and deliver
business benefits by allowing identical cloud deployments to occur
in different cloud provider solutions, either for the purposes of
disaster recovery or for the global deployment of a distributed single
solution.
C is the right Answer.
Reversibility refers to the possibility to remove ALL your data from the cloud; after moving it to another location first, of course.
There is a thinner line between Reversibility and Interoperability though, the second one refers to the possibility to work with more than one cloud solution.
Per CBK 3rd, page 18.
Portability refers to data or Architecture portability.
Reversibility is a measure of the extent your cloud services can be moved from one cloud
to another.
A is the answer
I will also go with A
I found
Reversibility is the extent to which cloud-based applications are designed so that they can be moved to other cloud providers or environments.
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