Compute and plot the magnitude and phase of the frequency response of the systems described by the following difference equations:

(a) \(y(n)=x(n)+2 x(n-1)+3 x(n-2)+2 x(n-3)+x(n-4)\)

(b) \(y(n)=y(n-1)+x(n)\)

(c) \(y(n)=x(n)+3 x(n-1)+2 x(n-2)\).