Answer (A) is correct . The most effective preventive measure against unauthorized interception of data is encryption. Encryption technology converts data into a code. Unauthorized users may still be able to access the data, but without the encryption key, they will be unable to decode the information. Encryption technology may be either hardware- or software-based.
Answer (B) is incorrect because Dial back systems are a primitive countermeasure that are only appropriate to old-style dialup modem connections.
Answer (C) is incorrect because Message acknowledgment procedures are a means only for affirming that a message has been received by the intended party; they do not provide any means of alert in case of interception by an unintended party.
Answer (D) is incorrect because Password codes must be assigned and saved on specific systems; they are not applicable to ongoing electronic transmission.
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