A. Update the EFS file system settings to enable server-side encryption using AES-256.
B. Create a new encrypted EFS file system and copy the data from the unencrypted EFS file system to the new encrypted EFS file system.
C. Use AWS CloudHSM to encrypt the files directly before storing them in the EFS file system.
D. Modify the EFS file system mount options to enable Transport Layer Security (TLS) on each of the EC2 instances.

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