When a client code programmer uses a class whose implementation is in a separate file from its interface, that implementation code is merged with the client's code during the

A$.$ programming phase.

B$.$ compiling phase.

C$.$ linking phase.

D$.$ executing phase.

$TC$P$/$IP relies on the to decide to which application a message should be delivered.

A$.$ MAC address

B$.$ SSID

C$.$ IP address

D$.$ port number