A. Agreements on how communication components and DTE's are to communicate
B. Logical communication channels for transferring data
C. Physical communication channels sued for transferring data
D. None of the above

Solution

A. Agreements on how communication components and DTE's are to communicate

Explanation

A protocol is a set of rules and guidelines for communicating data. Rules are defined for each step and process during communication between two or more computers. Networks have to follow these rules to successfully transmit data.

Example of Some Protocol is:

HTTP

HTTPS

FTP

SMTP