Final answer:
A CFO or other executive should seek legal advice if unsure about the legality of a business action to prevent potential legal and fiduciary breaches.
Step-by-step explanation:
When a chief financial officer (CFO) or other executive is uncertain about the legality of a business action, the most prudent step is to seek legal advice before proceeding. Acting without a clear understanding of the legal implications can lead to violations of fiduciary duties and substantial legal and financial consequences. Corporations have a legal obligation to their shareholders to operate within the bounds of the law, and executives are expected to exercise due diligence in this regard. The board of directors, as a part of corporate governance, is responsible for oversight and should ensure that such due diligence is followed.