What is the best practice for storing the Master CD?

What is the best practice for storing the Master CD?
A . Copy the files to the Vault server and discard the CD.
B . Copy the contents of the CD to a Hardware Security Module and discard the CD.
C . Store the CD in a secure location, such as a physical safe.
D . Store the CD in a secure location, such as a physical safe, and copy the contents of the CD to a folder (secured with NTFS permissions} on the vault.

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Answer: D