39. Which answer is not true for Diffie-Hellman algorithm?

Вариант ответа 1 - A. Security stems from the difficulty of calculating the product of two large prime numbers.

Вариант ответа 2 - B. It was the first public key exchange algorithm.

Вариант ответа 3 - C. It is vulnerable to man-in-the-middle attacks.

Вариант ответа 4 - D. It is used for distribution of a shared key, not for message encryption and decryption.