The correct answer is: A. User Datagram Protocol (UDP)
User Datagram Protocol (UDP) is a connectionless protocol, which means that it does not establish a connection between the sender and receiver before sending data. This makes it faster than connection-oriented protocols like TCP, but it also means that there is no guarantee that the data will be received. UDP is often used for applications where speed is more important than reliability, such as video streaming or online gaming.
File Transfer Protocol (FTP) is a standard network protocol used to transfer computer files between a client and server on a computer network. FTP is built on a client-server model, where the client initiates the connection and requests a file transfer from the server. The server then sends the file to the client, and the client receives it.
Simple Mail Transfer Protocol (SMTP) is an application-layer protocol for electronic mail (email) transmission. SMTP is defined by RFC 821 and is the standard protocol for sending email between servers. SMTP is a text-based protocol, and it uses a simple
command-line interface.Telnet is a network protocol that allows a user to log in to a remote computer and execute commands on that computer. Telnet is a text-based protocol, and it uses a simple command-line interface.
In conclusion, the correct answer is: A. User Datagram Protocol (UDP). UDP is a connectionless protocol that is often used for applications where speed is more important than reliability.