Final answer:
The NAR Code of Ethics is updated every three years to reflect changes in the real estate industry and address emerging ethical issues.
Step-by-step explanation:
The NAR Code of Ethics, which is a code of conduct for real estate professionals, is updated every three years. The National Association of Realtors (NAR) reviews and revises the code to ensure it reflects the changing landscape of the real estate industry and addresses emerging ethical issues. By updating the code regularly, the NAR helps real estate professionals maintain ethical standards in their practice.