177. Which of the following statement is most accurate of digital signature?

Вариант ответа 1 - A. It allows the recipient of data to prove the source and integrity of data.

Вариант ответа 2 - B. It can be used as a signature system and a cryptosystem.

Вариант ответа 3 - C. It is a method used to encrypt confidential data.

Вариант ответа 4 - D. It is the art of transferring handwritten signature to electronic media.