A tenant must purge data from a public cloud object store and cannot obtain physical access to the underlying hardware. Which technique does NIST SP 800-88 identify as often the only viable one?

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Answer 1

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Answer: B. Cryptographic erase.

For logical or virtual storage the physical media is abstracted from the data owner, so sanitizing it is impossible and cryptographic erase is frequently the only purge option.

Source: NIST SP 800-88 Rev. 2 (NIST) — SP 800-88 Rev. 2 > 3.1.2 Purge Sanitization Method