Which of the following are four defenses to patent-infringement claims?

Question

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The four defenses to patent-infringement claims are noninfringement, invalidity of the patent, misuse of the patent, and innocent infringement. Option A includes all four, while the other options do not have all the correct defenses. Option B includes fair use, which is not a defense to patent infringement. Option C includes fair use, which is not a defense, and excludes invalidity of the patent. Option D includes fair use and illegality of the patent, which are not defenses to patent infringement.

Which of the Following Are Four Defenses to Patent-Infringement Claims