Select the best definition of Pudendal nerve.

A. A specialized pacemaker region located near the superior vena cava in the right atrium. B. A hindbrain structure essential for coordination, balance and motor learning. C. A major nerve that passes through the carpal tunnel and supplies thenar muscles and sensation to the lateral hand. D. The main somatic nerve of the perineum, arising from sacral roots S2 to S4.