137. Consider the following statements: Nichol?s chart gives information about: 1. Closed-loop frequency response 2. The value of the peak magnitude of the closed-loop frequency response Mp 3. The frequency at which Mp occurs Which of the above statements are correct? (a) 2 and 3 (b) 1 and 2 (c) 1 and 3 (d) 1, 2 and 3