The claim of a patent right consists of four technical features: A, B, C and D. Q: How to explain the answer C?

The scope of protection of patent rights shall be determined in accordance with the principle of universal application. A patent claim consists of four technical features: A, B, C and D. Option C, a technical scheme consisting of five technical features: A, B, C, D and E, contains all technical features of the patent, comprehensively covers all technical features of the patent involved, and belongs to the scope of patent protection involved.