The circuit shown in the figure has 4 boxes each described by inputs P, Q, R and outputs Y, Z with Y = P Q R,\,\, Z = RQ + P R + Q P The circuit acts as a

The circuit shown in the figure has 4 boxes each described by inputs P, Q, R and outputs Y, Z with $$\text{Y}=\text{P}\oplus \text{Q}\oplus \text{R,}\text{Z}=\text{RQ}+\overline{\text{P}}\text{R}+\text{Q}\overline{\text{P}}$$
The circuit acts as a

Answer: Option B