Refer to the exhibit.
You have configured R1 and R2 as shown, but the routers are unable to establish a site-to-site VPN tunnel. What action can you take to correct the problem?
A . Edit the crypto keys on R1 and R2 to match.
B . Edit the ISAKMP policy sequence numbers on R1 and R2 to match.
C . Set a valid value for the crypto key lifetime on each router.
D . Edit the crypto isakmp key command on each router with the address value of its own interface.