A. Take a manual snapshot of the unencrypted DB cluster. Create an encrypted copy of that snapshot in the same AWS Region as the unencrypted snapshot. Restore a DB cluster from the encrypted snapshot.
B. Create an AWS Key Management Service (AWS KMS) key in the same AWS Region and create a new encrypted Aurora cluster using this key.
C. Take a manual snapshot of the unencrypted DB cluster. Restore the unencrypted snapshot to a new encrypted Aurora PostgreSQL DB cluster.
D. Create a new encrypted Aurora PostgreSQL DB cluster. Use AWS Database Migration Service (AWS DMS) to migrate the data from the unencrypted DB cluster to the encrypted DB cluster.

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