It is unethical for government officials to use their knowledge of impending policies to financially benefit themselves if that knowledge is not available to the general public. Which one of the following actions would be unethical according to the principle stated above? ['A company whose former manager is now an official with the Department of Natural Resources was one of several bidders for an extremely lucrative contract with the department; the names of the bidders were not disclosed to the public.', 'A retired high-ranking military officer now owns a company that contracts with the Department of Defense. He uses his contacts with department officials to help his company obtain contracts.', 'A Finance Department official, one of the few people who knew of a plan to tax luxury cars, bought a luxury car just before the plan was announced to the public in order to avoid paying the tax.', 'An official with a government agency that regulates securities sold her stock in Acme just after she announced to the public that her agency was investigating Acme for improper accounting.']