Four inputs A, B, C, D are fed to a NOR gate. The output of NOR gate is fed to an inverter. The output of inverter is

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Question: Four inputs A, B, C, D are fed to a NOR gate. The output of NOR gate is fed to an inverter. The output of inverter is
[A].

A + B + C + D

[B].

A + B + C + D

[C].

ABCD

[D].

ABCD

Answer: Option A

Explanation:

Output = = A + B + C + D.