Which of the following statements that describe Diffie Hellman Key exchange are correct？ （）
- A A DH key exchange is an algorithm that utilizes asymmetric cryptographic keys.
- B The DH key exchange is used to establish a shared secret over an insecure medium during an IPSec phase 1 exchange.
- C The DH exchange is susceptible to man-in-the-middle attacks.
- D The DH exchange is used to authenticate the peer device duringan IPSec phase 1 exchange.
- EA DH exchange provides Perfect Forward Secrecy （PFS）.