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Find the correct combination of A, B, C and D inputs which can cause the LED to glow.
Condition for $$Y_{top} = 1$$: $$A + B = 1 \implies (A, B) \neq (0, 0)$$
Condition for $$Y_{bottom} = 0$$: $$\overline{C + D} = 0$$
$$C + D = 1 \implies (C, D) \neq (0, 0)$$
Checking options, (D) matches these conditions.
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