Which of the following protocol pairs can be used to send and retrieve e-mails (in that order)?
Simple Mail Transfer Protocol (SMTP) is the standard protocol for sending emails across the Internet.
IMAP and POP3 are the Internet mail protocols used for retrieving emails.
MIME allows the users to exchange different(non-ASCII) kinds of data files in an email : audio, video, images, etc
So from the given options, option B is the correct one i.e. SMTP to send e-mail and POP3 to retrieve e-mail.
option B is correct SMTP for sending and POP3 for retrieving .