9. þ C. The CROSSCHECK command verifies that the repository does
accurately reflect reality.
ý A, B, and D. A is wrong because CROSSCHECK does not validate
whether the backups are good—only whether they exist. B is wrong because
CROSSCHECK doesn’t delete references to missing backups; it only flags them
as expired. D is wrong because CROSSCHECK confirms the existence of both
backup sets and image copies.
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