Consider the multiband ideal filter given by the amplitude response:A(ejω)=⎩⎨⎧​0,0.5,1,0.5,1.​0<∣ω∣<0.2π0.2π<∣ω∣<0.4π0.4π<∣ω∣<0.6π0.6π<∣ω∣<0.8π0.8π<∣ω∣<π​(a) Obtain a linear-phase FIR filter using the rectangular window of orderM=10. Compute and plot the amplitude response over−π≤ω≤π. (b) Repeat (a) usingM=20,M=40, andM=60. window of orderM=10,M=20,M=40andM=60