18. For an all-pass system \(H(z)={(z^{-1}-b)\over (1-az^{-1})}, where |H(e^{-j\omega})|=1\) , for all \(\omega\) , If Re(a)≠0,lm(a)≠0 , then b equals

(A)  a

(B)  a*

(C)  1/a*

(D)  1/a

Hint: 
Explanation: 

Answer-(B)  a*
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