Mark works as a System Analyst for Blue Well Inc. He uses Microsoft Outlook 2010 for messaging
and e-mailing. MS Outlook has been configured to use an Exchange account. Mark sends an email
message that contains some attachments about a sales meeting. However, the recipients of the email message receive a Winmail.dat attachment. Which of the following is the most likely cause of
this issue?

A.
The e-mail message was in HTML format.

B.
The e-mail message was in plain text format.

C.
The e-mail message was in RTF format.

D.
The e-mail message was in XPS format.