Which describes a best practice rule for controlling traffic between the corporate network and the controls network?

Which describes a best practice rule for controlling traffic between the corporate network and the controls network?
A. Outbound traffic from the control network to the corporate network and outbound traffic from the corporate network to the control network can be restricted based on source and destination address only.
B. Outbound traffic from the corporate network to the control network should be restricted but outbound traffic from the control network to the corporate network should not be restricted.
C. Outbound traffic from the control network to the corporate network should be restricted based on source and destination address and service only.
D. Outbound traffic from the control network to the corporate network should be restricted based on source and destination address, service, and port.

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