In your company it has been decide to create a custom firewall using IPTables. You have been given the task of configuration and implementation. What is the first step you should take?

A.
Set the three default policies (Input, Output, and Forward) to DENY.

B.
Set the Output policy to DENY

C.
Set the Input policy to DENY

D.
Set the Forward policy to DENY

E.
Set the Masquerade policy to DENY