Mark works as a Support Analyst for Blue Well Inc. He uses Microsoft Outlook for messaging and
emailing. MS Outlook has been configured to use his e-mail account. He composes an e-mail
message to send it to the CEO of the company. After composing the message, he assigns a flag to it.
However, Mark discovers that all the messages that have been flagged have disappeared. Which of
the following is the most likely cause of the issue?

A.
He is using a POP3 e-mail account.

B.
He is using an IMAP e-mail account.

C.
He is using an HTTP e-mail account.

D.
He is using a MAPI e-mail account.