The correct answer is option 2: By Law. Liberty can be limited through the enactment and enforcement of laws. Laws are established to regulate and govern society, ensuring that individual liberties do not infringe upon the rights and well-being of others. These laws set boundaries and restrictions on certain behaviors or actions that could cause harm or disrupt social order. By creating and implementing laws, governments have the power to curtail certain freedoms in order to maintain public safety and constitutional rights. It is important to note that the limitation of liberty through laws should be balanced, ensuring that the laws are justified, proportionate, and in line with fundamental human rights principles.