Final answer:
The RR's email is considered correspondence and is subject to review by his firm. (option A)
Step-by-step explanation:
The correct answer is A) It is considered correspondence and is subject to review by his firm.
When a registered representative (RR) receives an email from a customer and sends a reply, it is considered correspondence. Correspondence refers to any written or electronic communication sent or received by a member firm, such as an email. This includes emails sent from the RR's personal email account or home computer. As correspondence, the email is subject to review by the RR's firm to ensure compliance with regulations and firm policies.
Therefore, the RR's email would be subject to review by the firm.