which three statements are correct?

You have been asked to establish a dynamic IPsec VPN between your SRX device and a
remote user. Regarding this scenario, which three statements are correct? (Choose three.)

A.
You can use all methods of encryption.

B.
Only policy-based VPNs are supported.

C.
Only predefined proposal sets can be used.

D.
You must use preshared keys.

E.
IKE aggressive mode must be used.