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.
• E、A DH exchange provides Perfect Forward Secrecy （PFS）.