The given circuit works as :
Text Solution
Verified by ExpertsThe correct answer is:
B
Let the inputs be A and B. The circuit is composed of NOR gates.
A NOR gate with its inputs tied together acts as a NOT gate.
The output of the first NOR gate (input A) is 
.
The output of the second NOR gate (input B) is 
.
These outputs are fed into a third NOR gate. Its output is 
.
Using De Morgan's theorem, 
.
This output 
is the input to the fourth NOR gate, which is configured as a NOT gate.
The final output is 
.
The expression 
represents a NAND gate.
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