A)
B)
C)
D)
Correct Answer: C
Solution :
When A and B are closed, bulb is short circuited. When
Also, when 
(No supply the bulb) | A | B | Y |
| 0 | 0 | 0 |
| 0 | 1 | 0 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |
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