Refer to the exhibit. A new TAC engineer came to you for advice. A GRE over IPsec tunnel
was configured, but the tunnel is not coming up.
What did the TAC engineer configure incorrectly? Select the best response.

A.
The crypto isakmp configuration is not correct.

B.
The crypto map configuration is not correct.

C.
The network 172.16.1.0 is not included in the OSPF process.

D.
The interface tunnel configuration is not correct.