You are composing an e-mail.
You want to add a signature to the e-mail. Subsequently, you want to add another signature to the e-mail. However, you are not able to add multiple signatures.
Which of the following is the most likely cause of the issue?
A. The e-mail is a reply of a message.
B. The e-mail is marked as read.
C. Only one signature can be added to the e-mail.
D. The e-mail is an outgoing message.
