A set of rules that governs data communication is called :

Correct option is A

A protocol is a set of rules that governs how data is transmitted and received in a network. It defines the format, timing, sequencing, and error-checking for data communication. Examples of protocols include TCP/IP, HTTP, and SMTP.
Important Key Points:
1. Protocol - Essential for ensuring that data can be correctly and reliably exchanged between different devices or systems in a network.
2. Data Communication - Involves different layers of protocols working together to provide proper and efficient data transfer.
Knowledge Booster:
• Standard: A standard defines specifications and guidelines for various technologies, including networking, but is not specifically a set of rules for how data is transmitted.
• RFC (Request for Comments): RFC documents are publications that describe standards and protocols related to the internet and networking, but they are not directly rules of data communication.
• Server: A server is a computer or system that provides resources, data, or services to other devices in the network, and is not related to the rules governing communication.