Answer:
c. prohibits the use of false or misleading subject lines on emails used for advertising.
Explanation:
The U.S. Congress enacted the CAN-SPAM Act in 2003 and this act covers a number of key aspects related to spamming like unsubscribe, content, and sending behavior. Under the Content compliance application mechanisms, the act clearly prohibits the use of false or misleading subject lines on emails used for advertising. The act directs that the subject line on email should be related to the body content of the email and that the relevance between the subject line and email content should be clearly identifiable.