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The output of OR gate is 1 :-
A
If either or both inputs are 1
B
Only if both inputs are 1
C
If either input is zero
D
If both inputs are zero
Detailed Solution
For an OR gate, $Y = A + B$.
Truth table: A = 0, B = 0 gives Y = 0; A = 0, B = 1 gives Y = 1; A = 1, B = 0 gives Y = 1; A = 1, B = 1 gives Y = 1.
So the output of an OR gate is 1 if either or both inputs are 1. It is 0 only when both inputs are 0.
(Output 1 only when both inputs are 1 describes an AND gate.)
Truth table: A = 0, B = 0 gives Y = 0; A = 0, B = 1 gives Y = 1; A = 1, B = 0 gives Y = 1; A = 1, B = 1 gives Y = 1.
So the output of an OR gate is 1 if either or both inputs are 1. It is 0 only when both inputs are 0.
(Output 1 only when both inputs are 1 describes an AND gate.)