Which is true about isalnum(c), where c is an int that can be represented as an unsigned char or EOF.isalnum(c) returns?

Non-zero if isalpha(c) or isdigit(c)

0 if not isalpha(c) or not isdigit(c)

Both Non-zero if isalpha(c) or isdigit(c) & 0 if not isalpha(c) or not isdigit(c)

Which is true about isalnum(c), where c is an int that can be represen

1.	Which is true about isalnum(c), where c is an int that can be represented as an unsigned char or EOF.isalnum(c) returns?
A.	Non-zero if isalpha(c) or isdigit(c)
B.	0 if not isalpha(c) or not isdigit(c)
C.	Both Non-zero if isalpha(c) or isdigit(c) & 0 if not isalpha(c) or not isdigit(c)
D.	None of the mentioned
Answer» D. None of the mentioned

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Which is true about isalnum(c), where c is an int that can be represented as an unsigned char or EOF.isalnum(c) returns?

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