Question

read the excerpt from the code book. by this stage, sending a pgp encrypted message is becoming quite complicated. the idea cipher is being used to encrypt the message, rsa is being used to encrypt the idea key, and another stage of encryption has to be incorporated if a digital signature is required. however, zimmermann developed his product in such a way that it would do everything automatically, so that alice and bob would not have to worry about the mathematics. to send a message to bob, alice would simply write her e-mail and select the pgp option from a menu on her computer screen. next she would type in bobs name, then pgp would find bobs public key and automatically perform all the encryption. at the same time pgp would do the necessary jiggery-pokery required to digitally sign the message. upon receiving the encrypted message, bob would select the pgp option, and pgp would decrypt the message and verify which fact most effectively supports the claim that pgp can be used by an ordinary person? pgp is used to encrypt digital messages. pgp is based on complicated mathematics. pgp incorporates a digital signature. pgp works efficiently on a personal computer.

Explanation:

The fact that PGP works efficiently on a personal computer implies that it is accessible and user - friendly for ordinary people. Just like other software on a personal computer, if it works efficiently, it can be easily used by non - technical individuals.
The other options do not directly support the claim that it is for an ordinary person. "PGP is used to encrypt digital messages" just states its function. "PGP is based on complicated mathematics" might suggest it is not for ordinary people. "PGP incorporates a digital signature" is about its feature, not its accessibility for ordinary users.

Answer:

PGP works efficiently on a personal computer.