Which of the following is the BEST example of maintaining ‘strategic flexibility’?

A.
Cloud provisioning models have a risk of not maintaining flexibility once services have been
migrated.

B.
When choosing services to migrate into the cloud, there should be a focus on ensuring that future
migration between different cloud providers can be facilitated.

C.
Cloud providers need to provide countermeasures to any consequences of not maintaining
flexibility of services in a strategic manner.

D.
When choosing services to migrate into the cloud, it should be ensured that the cloud provider
can change underlying hardware platforms in case the customer needs change.