Which of the following explanations best describes the function of a Transmission Control Protocol $($TCP$)$ or User Datagram Protocol $($UDP$)$ port number?

Group of answer choices

The port number is used only by the receiver, to indicate the application process running on the sender$.$

The port number indicates to the receiver that the sender can activate a specific port only.

The port number is used by both the sender and the receiver to negotiate a well$-$known server port for the communicating processes.

The port number is used by both the sender and the receiver to identify the application that generated the information in the datagram