Correct option is D, Patents is not an example of a type of law that tries to foster competition.
In return for publishing an enabling disclosure of the invention, the owner of a patent is granted the legal right to prevent others from creating, using, or selling the invention for a set amount of time. In the majority of nations, patent rights are governed by private law, and in order to enforce them, the patent holder must file a lawsuit against a third party who violates the patent. Patents are an important source of competitive advantage in some industries, but they are irrelevant in others.
According to national laws and international agreements, the process for issuing patents, requirements placed on the patentee, and the scope of the exclusive rights differ greatly between countries.
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