H(ejω) is the frequency response of a discrete time LTI system and H1(ejω) is the frequency response of its inverse function. Then

H(ejω) is the frequency response of a discrete time LTI system and H1

1.	H(ejω) is the frequency response of a discrete time LTI system and H1(ejω) is the frequency response of its inverse function. Then
A.	H(ejω)H1(ejω) = 1
B.	H(ejω)H1(ejω) = δ(ω)
C.	H(ejω) * H1(ejω) = 1
D.	H(ejω) * H1 (ejω) = δ(ω)
Answer» B. H(ejω)H1(ejω) = δ(ω)