The correct answer is option 3: American Trade Law.

Option 1 is incorrect as `Super 301` is not the name of a modern computer.

Option 2 is incorrect as `Super 301` is not a new variety of wheat.

Option 4 is incorrect as `Super 301` is not a new vaccine for AIDS.

Super 301 refers to a provision within the American Trade Law. It was a trade measure enacted in 1988 by the United States to address unfair trade practices and inadequate intellectual property protection by other countries.

Under Super 301, the United States Trade Representative (USTR) identifies and investigates foreign countries that are engaging in unfair trade practices, such as infringing on intellectual property rights or imposing discriminatory trade barriers. If a country is found to be in violation, the USTR can take action, such as imposing tariffs or other trade sanctions, in order to encourage compliance with international trade rules.

Overall, Super 301 is a mechanism used by the United States to promote fair trade and protect American businesses from unfair competition.