The circuit show in the figure has 4 boxes each described by inputs P, Q, R and outputs y, z withY = P ‚äï Q ‚äï R, Z = RQ + PR + QP The circuit act as a

The circuit show in the figure has 4 boxes each described by inputs P,

1.	The circuit show in the figure has 4 boxes each described by inputs P, Q, R and outputs y, z withY = P ‚äï Q ‚äï R, Z = RQ + PR + QP The circuit act as a
A.	4 bit adder giving P + Q
B.	4 bit subtractor P - Q
C.	4 bit subtractor Q - P
D.	4 bit adder P + Q + R
Answer» C. 4 bit subtractor Q - P