1. Federal Trade Commission (FTC). CAN-SPAM Act: A Compliance Guide for Business.
Page 2, "Tell recipients how to opt out of receiving future email from you": "You must honor a recipient’s opt-out request within 10 business days." This directly refutes option D.
Page 1, "Don’t use false or misleading header information" and "Don’t use deceptive subject lines": These sections support the requirement in option A.
Page 2, "Tell recipients where you’re located": "Your message must include your valid physical postal address." This supports the requirement in option B.
Page 2, "Tell recipients how to opt out of receiving future email from you": "Your message must include a clear and conspicuous explanation of how the recipient can opt out..." This supports the requirement in option C.
2. University of Washington. IT Connect: CAN-SPAM Act Guidance.
Section: "What are the main requirements of the CAN-SPAM Act?": This document outlines the key provisions, including: "Honor opt-out requests promptly. You must be able to process opt-out requests for at least 30 days after sending your message. You must honor a recipient’s opt-out request within 10 business days." This corroborates the FTC's 10-day rule and confirms option D is incorrect. The page also lists the requirements for a valid physical address and clear identification as an advertisement.