Which of the following are differences between IPsec main mode and IPsec aggressive mode?

Which of the following are differences between IPsec main mode and IPsec aggressive mode?

(Choose two.)

Response:
A . Aggressive mode supports XAuth, while main mode does not.
B . Six packets are usually exchanged during main mode, while only three packets are exchanged during aggressive mode.
C . The first packet of aggressive mode contains the peer ID, while the first packet of main mode does not.
D . Main mode cannot be used for dialup VPNs, while aggressive mode can.

Answer: BC