A. Request KMS to provide the stored unencrypted data key and then use the retrieved data key to decrypt the data.
B. Keep the plaintext data key stored in Amazon DynamoDB protected with IAM policies. Query DynamoDB to retrieve the data key to decrypt the data
C. Use the Encrypt API to store an encrypted version of the data key with another customer managed key. Decrypt the data key and use it to decrypt the data when required.
D. Store the encrypted data key alongside the encrypted data. Use the Decrypt API to retrieve the data key to decrypt the data when required.

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