Which two statements about the DH group are true? (Choose two.)

A.
The DH group is used to provide data authentication.

B.
The DH group is negotiated in IPsec phase-1.

C.
The DH group is used to provide data confidentiality.

D.
The DH group is used to establish a shared key over an unsecured medium.

E.
The DH group is negotiated in IPsec phase-2.