Correct Answer - Option 2 : Application
Application layer protocols: FTP, SMTP and IMAP
- Simple Mail Transfer Protocol (SMTP) is the standard protocol for sending emails across the Internet.
- IMAP is the Internet mail protocols used for retrieving emails.
Open Shortest Path First (OSPF) is a routing protocol for Internet Protocol (IP) networks. It uses a link state routing (LSR) algorithm and falls into the group of interior gateways.