a.) The __ NAT allows packets from any server to come through to a client as long as they have the correct destination port the NAT has chosen for a host.
b.) The __ NAT allows packets to go to a client only if the source address and source port are from the server which the client has already opened communication with. The destination port must also be the same.
c.) The _____ NAT allows packets to go to a client only from the server with which the client has opened communication with, but packets can come from any port on that server.
d.) The _____ NAT creates a new port to communicate with for each new server and port a client communicates with. In other words, each server and port has a unique destination port in order to communicate with the client through the NAT.