The diagram shows your network. The gateway A will want to start IKE negotiation with gateway B to build a VPN tunnel for the control connection as both gateways do belong to the same community. What is likely to be the consequence of turning off implicit rules?

A.
You will not be able to install a Policy on a Remote gateway A

B.
The gateway B will have to re-configured

C.
You will not be able to install a Policy on both gateways A and B

D.
You will not be able to install a Policy on a Remote gateway B

E.
You will be able to install a Policy on both gateways A and B