Which protocol is commonly used for sending emails?

• A. HTTP
• B. FTP
• C. SMTP
• D. SNMP

Answer: (C)

The protocol commonly used for sending emails is Simple Mail Transfer Protocol (SMTP). SMTP is specifically designed for the purpose of sending and relaying email messages across networks, making it the backbone of email transmission. When you send an email, your email client uses SMTP to communicate with your email server. This protocol is essential in the process of sending your messages to the recipient's email server, which can then deliver it to the recipient's inbox.

Other protocols listed serve different purposes: HTTP (Hypertext Transfer Protocol) is primarily used for transferring hypertext documents on the web, FTP (File Transfer Protocol) is used for transferring files between computers on a network, and SNMP (Simple Network Management Protocol) is utilized for network management and monitoring. Therefore, while each of these protocols has specific functions in digital communication, SMTP is the correct choice for sending emails due to its specialized role in that process.