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Following gates section is connected in a complete suitable circuit. For which of the following combination, bulb will glow (ON):

1. A = 0, B = 1, C = 1, D = 1
2. A = 1, B = 0, C = 0, D = 0
3. A = 0, B = 0, C = 0, D = 1
4. A = 1, B = 1, C = 1, D = 0

Correct answer: A = 1, B = 0, C = 0, D = 0

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