The function is lower(char) checks whether a character is in lower case or not, therefore it should return

The function is lower(char) checks whether a character is in lower cas

1.	The function is lower(char) checks whether a character is in lower case or not, therefore it should return
A.	0 or 1
B.	-1,0 or 1
C.	a character
D.	nothing
Answer» B. -1,0 or 1