181. Of the followings, which is the best description of a digital signature?

Вариант ответа 1 - A. The sender encrypts a message digest with his/her public key

Вариант ответа 2 - B. The sender encrypts a message digest with his/her private key

Вариант ответа 3 - C. The recipient encrypts a message digest with his/her public key

Вариант ответа 4 - D. The recipient encrypts a message digest with his/her private key