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