3.14 The signal m(t) = {t, 0 ≤ t < 1 −t+2, 1 < t ≤ 2 0.1 otherwise frequency-modulates a carrier with frequency 1000 Hz. . The deviation constant is kf = 25. a. Determine the range of the instantaneous frequency of the modulated signal. b. Determine the bandwidth of the modulated signal. c. Plot spectra of the message and the modulated signal. d. Determine the modulation index.