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?

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.

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Answer: A