Go back to 77-884 - Outlook 2010

Question :-

Mark works as an Office Assistant for ABC Inc. He uses Microsoft Outlook that has been configured to use an IMAP account. Mark composes an e-mail and adds a signature to it. He now wants to add another signature to the e-mail. However, he is not able to add multiple signatures. Which of the following is the most likely cause of the issue?
Only one signature can be added to the e-mail.
The e-mail is an outgoing message.
The e-mail is a reply of a message.
The e-mail is marked as read.

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