If PM is the perpendicular from $P(2,3)$ onto the line $x+y=3, then the co-ordinates of M are :

Question

$$\begin {array} {1 1} (a)\;(2,1) & \quad (b)\;(-1,4) \\ (c)\;(1,2) & \quad (d)\;(4,-1) \end {array}$$