Z transform and its Application on Digital Signal Processing related Questions and Answers

Question :   If X(z) has M finite zeros and N finite poles, then which of the following condition is true? 1. |N-M| poles at origin(if N>M) 2. |N+M| zeros at origin(if N>M) 3. |N+M| poles at origin(if N>M) 4. |N-M| zeros at origin(if N>M) Answer :   4 - |N-M| zeros at origin(if N>M)