The correct answer is: C. protocol
Telnet is a network protocol that allows a user to log in to a remote computer and execute commands on that computer. It is a text-based protocol, which means that all communication between the client and server is in the form of text. Telnet is often used to manage servers and other network devices.
A search engine is a software application that helps users find information on the internet. Search engines work by crawling the web and indexing websites. When a user searches for a term, the search engine returns a list of websites that match the search terms.
A browser is a software application that allows users to access and view web pages. Browsers work by downloading web pages from servers and displaying them on the user’s computer.
A gateway is a device that connects two or more networks. Gateways are often used to connect networks that use different protocols.
I hope this helps!