The given electrical network is equivalent to:

Question

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Answer 1

If we put input as A=0 B= 0 then we are get out put as F=1
In similar way the following shown in the table are also true.
The resulting table is nothing but the truth table of NOR gate.
Hence option D is the correct answer.

Answer 2

If we put input as A=0 B= 0 then we are get out put as F=1

In similar way the following shown in the table are also true.

The resulting table is nothing but the truth table of NOR gate.

Hence option D is the correct answer.