Which two statements describe how IPsec phase 1 main mode id different from aggressive mode when performing IKE negotiat

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Which two statements describe how IPsec phase 1 main mode id different from aggressive mode when performing IKE negotiation? (Choose two.)

A. A peer ID is included in the first packet from the initiator, along with suggested security policies.
B. XAuth is enabled as an additional level of authentication, which requires a username and password.
C. A total of six packets are exchanged between an initiator and a responder instead of three packets.
D. The use of Diffie Hellman keys is limited by the responder and needs initiator acceptance.