Which three statements are functions that are performed by IKE phase 1?

Which three statements are functions that are performed by IKE phase 1? (Choose three.)

A.
It builds a secure tunnel to negotiate IKE phase 1 parameters.

B.
It establishes IPsec security associations.

C.
It authenticates the identities of the IPsec peers.

D.
It protects the IKE exchange by negotiating a matching IKE SA policy.

E.
It protects the identities of IPsec peers.

F.
It negotiates IPsec SA parameters.