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A bulb in a staircase has two switches, one switch being at the ground floor and the other one at the first floor. The bulb can be turned ON and also can be turned OFF by any one of the switches irrespective of the state of the other switch. The logic of switching of the bulb resembles
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- an AND gate
- an OR gate
- an XOR gate
- a NAND gate
Correct Option: C
Let us consider the switches A and B and bulb Y. Switches can be 2 positions up (0) or down (1) Starting with both A and B in up position. Let the bulb be OFF. N ow since B can oper at e independently when B goes down, the bulb goes ON 
