The logic circuit shown above is equivalent to:

$$\text{Main Circuit Expression: } C = \overline{A + \bar{B}} = \bar{A} \cdot \overline{\overline{B}} = \bar{A} \cdot B$$

$$\text{Option (A) Circuit Expression: } C = \overline{A \cdot \bar{B}} = \bar{A} + B$$

$$\text{Option (B) Circuit Expression: } C = \overline{A + B}$$

$$\text{Option (C) Circuit Expression: } C = \bar{A} \cdot B$$

$$\text{Option (D) Circuit Expression: } C = \overline{\bar{A} \cdot B}$$