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The correct answer is B.

OBJ-1.6: To mitigate the risk of data remanence, you should implement full disk encryption. This method will ensure that all data is encrypted and cannot be exposed to other organizations or the underlying IaaS provider. Using a zero wipe is typically impossible because VM systems may move without user intervention during scaling and elasticity operations. Data masking can mean that all or part of a field’s contents is redacted, by substituting all character strings with “x,” for example. Data masking will not prevent your corporate data from being exposed by data remanence. Spanning multiple disks will leave the data accessible, even though it would be fragmented, and would make the data remanence problem worse overall.

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