The transfer function of 4 points MA IIR filter is

Question

H(z)=14[1−z−41−z−1]

H(z)=14[1−z−41−z−4]

H(z)=14[1−z−2−z−41−z−1]

H(z)=14[1−z−81−z−1]

Answer 1

H(z)=14[1−z−41−z−1]