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During an audit of a telecommunications system, an IS auditor finds that the risk of intercepting
data transmitted to and from remote sites is very high. The MOST effective control for reducing this
exposure is:

A.
encryption.

B.
callback modems.

C.
message authentication.

D.
dedicated leased lines.

Explanation:
Encryption of data is the most secure method. The other methods are less secure, with leased lines
being possibly the least secure method.

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