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

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.

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Answer: B