In order to ensure that the firewall can effectively protect the network from external attacks, which of the following basic practices should be followed?

 In order to ensure that the firewall can effectively protect the network from external attacks, which of the following basic practices should be followed?
A . Only allow the necessary external services.
B . All external communications must go through firewall.
C . The firewall must be placed in non-protected area (DMZ)
D . An external information filter must be defined

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Answer: A