A. Enable automatic key rotation for the CMK, and specify a period of 6 months.
B. Create a new CMK with new imported material, and update the key alias to point to the new CMK.
C. Delete the current key material, and import new material into the existing CMK.
D. Import a copy of the existing key material into a new CMK as a backup, and set the rotation schedule for 6 months.

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