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?
A. Only one signature can be added to the e-mail.
B. The e-mail is an outgoing message.
C. The e-mail is a reply of a message.
D. The e-mail is marked as read.