A. Create new AWS managed keys. Configure the key schedule for the annual rotation. Create an alias to point to the new keys.
B. Enable automatic annual key rotation for the existing customer managed CMKs. Update the application encryption library to use a new key ID for all encryption operations. Fall back to the old key ID to decrypt data that was encrypted with previous versions of the key.
C. Create new AWS managed CMKs. Configure the key schedule for annual rotation. Create an alias to point to the new CMKs.
D. Enable automatic annual key rotation for the existing customer managed CMKs. Update the application encryption library to use a new key ID for all encryption operations. Create a key grant for the old CMKs and update the code to point to the ARN of the grants.

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