Consider the periodic signal given below. A. Find the period 7, and fundamental frequency of the signal. (5 points) 3.5 3 2.5 2 1.5 1 0.5 -10 -5 5 10 0 Time (s) B. Compute the exponential Fourier series coefficients D, from the definition. You should be 2-1 able to manipulate your expression for D, into the form D =- where a is a positive real number. (15 points) C. Assume that D = 2-1 plot | DI. the amplitude spectrum of the above periodic signal for 2-jn2x n=-2,-1.0, 1, 2. (Note: D, is given for consistency of the plots; the D, you got above will NOT be the same.) (10 points)