The correct answers are 1 and 2. The word protocol comes from a latin word referring to the first page of a book in which the content was written, it was adapted to english to refer to rules of conduct that rule any given thing. So a communication protocol will provide guidelines to the communication between the sender and the recipient of a message, this applies even when the message is shared between friends, relatives or coworkers.
A communication protocol is a system of rules that allow the entities of a communication system exchange information. They can cover authentication, correction, error detection and signaling. They are basically used in computer networks and these can not work without it.
Thus,
The statements that are true are:
1. A communication protocol is set up to stablish a relationship between the sender and recipient of the message.
3. A communication protocol does not cover etiquette that needs to be followed during professional conduct.
