Question 3: (25 Marks) Is causal? A causal discrete time sequence h(n) are: h(n)=-28(n)+38(n-1)+28(n-2)+h(n-1)+h(n-2)+h(n-3). a. Write the first ten number of the sequence, h(n) for n=0,1,...,.9? b. Calculate the modulo-4 wrapped signal of the sequence in (a). c. Calculate the 4-DFT of the wrapped signal in (b) d. Calculate the 4-FFT of the sequence in (b) e. Finally, compute the 4-point IDFT of the result and verify that you recover the mod-4 wrapped version of h(n) in question (b).