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Encryption at rest primarily protects data:

AOnly on Sundays
BWhile the user is on a phone call about it
CWhile it is being typed at the keyboard
DWhile it is stored on disk or in a backup, typically using AES or similar block ciphers
Answer & Solution
Correct answer: D. While it is stored on disk or in a backup, typically using AES or similar block ciphers
At rest = on disk, protected by block ciphers (often AES-256), with keys managed in a KMS. The other options describe unrelated user behaviour or fiction.
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