And please give a motivation to why.

A user sends an email message from a computer to another user over the Internet. The other user receives and reads the email on his/her computer. The message is transferred in several steps over the Internet, in this case with the e-mail protocols SMTP and IMAP. Which of the following alternatives represents a valid (and likely) order in which the protocols are used? IMAP, SMTP, SMTP IMAP, IMAP, SMTP IMAP, SMTP, IMAP SMTP, IMAP, SMTP SMTP, SMTP, IMAP SMTP, IMAP, IMAP