The pole-zero plots of three discrete-time systems P, Q and

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The pole-zero plots of three discrete-time systems P, Q and R on the z-plane are shown below.

Which one of the following is TRUE about the frequency selectivity of these systems?

[GATE EE 2017 Set 2]

A All three are high-pass filters.

B All three are band-pass filters.

C All three are low-pass filters.

D P is a low-pass filter, Q is a band-pass filter and R is a high-pass filter.