Q20. Following gates section is connected in a complete suitable circuit.\\
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For which of the following combination, bulb will glow (ON) :\\
(1) $\mathrm { A } = 0 , \mathrm {~B} = 0 , \mathrm { C } = 0 , \mathrm { D } = 1$\\
(2) $\mathrm { A } = 0 , \mathrm {~B} = 1 , \mathrm { C } = 1 , \mathrm { D } = 1$\\
(3) $\mathrm { A } = 1 , \mathrm {~B} = 0 , \mathrm { C } = 0 , \mathrm { D } = 0$\\
(4) $\mathrm { A } = 1 , \mathrm {~B} = 1 , \mathrm { C } = 1 , \mathrm { D } = 0$