What action will bring the VPN up and allow traffic to start passing between the sites?

A VPN connection is set up between Site-A and Site-B, but no traffic is passing in the system log of Site-A, there is an event logged as like-nego-p1-fail-psk.

What action will bring the VPN up and allow traffic to start passing between the sites?
A . Change the Site-B IKE Gateway profile version to match Site-A,
B . Change the Site-A IKE Gateway profile exchange mode to aggressive mode.
C . Enable NAT Traversal on the Site-A IKE Gateway profile.
D . Change the pre-shared key of Site-B to match the pre-shared key of Site-A

View Answer

Answer: D