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Which of the following protocol pairs can be used to send and retrieve e-mails (in that order)?

1. $\textsf{IMAP, POP3}$
2. $\textsf{SMTP, POP3}$
3. $\textsf{SMTP, MIME}$
4. $\textsf{IMAP, SMTP}$

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.

SMTP and POP3 protocols are used in order to send and retrieve e-mails.

option B is correct SMTP for sending and POP3 for retrieving .

For sending you can use SMTP or MIME

for retreiving you can use POP3 or IMAP4

So as per options

Option B is correct
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