When you deploy DMVPN, what is the purpose of the command crypto isakmp key ciscotest address 0.0.0.0 0.0.0.0?

When you deploy DMVPN, what is the purpose of the command crypto isakmp key ciscotest address 0.0.0.0 0.0.0.0?
A . It is configured on hub and spoke router to establish peering
B . It is configured on hub to set the pre-shared key for the spoke routers
C . It is configured on the spokes to indicate the hub router
D . It is configured on the Internet PE routers to allow traffic to traverse the ISP core

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Answer: B