What is the result of running the crypto isakmp key ciscXXXXXXXX address 172.16.0.0 command?.

What is the result of running the crypto isakmp key ciscXXXXXXXX address 172.16.0.0 command?.
A . authenticates the IKEv2 peers in the 172.16.0.0/16 range by using the key ciscXXXXXXXX
B . authenticates the IP address of the 172.16.0.0/32 peer by using the key ciscXXXXXXXX
C . authenticates the IKEv1 peers in the 172.16.0.0/16 range by using the key ciscXXXXXXXX
D . secures all the certificates in the IKE exchange by using the key ciscXXXXXXXX

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Answer: B