The three statements according to Poley-Wiener criterion for an amplitude response to be realizable are:
(i) The magnitude |H(jω)| of a realizable network can be zero at a discrete set of frequencies, but it cannot have zero magnitude over a finite band of frequencies.
(ii) The amplitude function |H(jω)| must not fall to zero faster than the exponential order.
(iii) Any ideal filter is non-causal. The true statements is/are—