Please explain in detail and show the solution.(a) Determine and sketch the deterministic auto-correlation of p1(t),i.e., Tp. (7) with the following techniques.i. Use the auto-correlation definition, i.e., evaluate the product of pi(t) and P1(t-7) for different 7 values and calculate the area under the product. Ob- serve that the auto-correlation of piecewise constant functions is continuous and piecewise linear. Hence, you can compute the area at a few critical points and connect the dots with a straight line!