Which of the following BEST describes why an air gap is a useful security control?

Which of the following BEST describes why an air gap is a useful security control?
A . It physically isolates two or more networks, therefore helping prevent cross contamination or accidental data spillage.
B . It requires that files be transferred via USB instead of networks that are potentially vulnerable to hacking, therefore preventing virus infections.
C . It requires multiple systems administrators with different credentials, therefore providing separation of duties.
D . It provides physical space between two interlocking doors, therefore providing additional control from unauthorized entry.

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Answer: A