Go back to 77-884 - Outlook 2010

Question :-

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 e - mail message receive a Winmail.dat attachment. Which of the following is the most likely cause of this issue?
The e-mail message was in HTML format.
The e-mail message was in plain text format.
The e-mail message was in RTF format.
The e-mail message was in XPS format.

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