When a packet arrives at the gateway, the gateway checks it against the rules in the top Policy Layer, sequentially from top to bottom, and enforces the first rule that matches a packet. Which of the following statements about the order of rule enforcement is true?

A. If the Action is Accept, the gateway allows the packet to pass through the gateway.

B. If the Action is Drop, the gateway continues to check rules in the next Policy Layer down.

C. If the Action is Accept, the gateway continues to check rules in the next Policy Layer down.

D. If the Action is Drop, the gateway applies the Implicit Clean-up Rule for that Policy Layer.