A function N (S) is said to have a pole (or zero) at infinity if the function N (1/S) has a pole (or zero) at S = ?

A function N (S) is said to have a pole (or zero) at infinity if the

1.	A function N (S) is said to have a pole (or zero) at infinity if the function N (1/S) has a pole (or zero) at S = ?
A.	∞
B.	2
C.	0
D.	1
Answer» D. 1