The circuit shown in the figure acts as
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → OR gate
The first symbol is an OR gate with a small circle on its output, that is a NOR gate, and its output is fed to a NOT gate (the triangle with a small circle). The output of the NOR gate is the complement of the OR output, and the NOT gate complements it again.
\( \displaystyle Y = \overline{\overline{A + B}} = A + B \)
A NOR gate followed by a NOT gate therefore works as an OR gate.