The three types of patents available under U.S. law are design, plant and utility.
A patent is an exclusive right granted for an invention, which is a product or a process that provides, in general, a new way of doing something, or offers a new technical solution to a problem.
It is the right from the federal government to produce and sell something for a certain number of years without anyone copying it.
Thus, option D is true as three types of patents available under U.S. law are design, plant and utility.
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