Steady two dimensional heat conduction takes place in the body shown in the fig below. The normal temperature gradients over surface P and Q can be considered to be uniform. The temperature gradient 
= at surface Q is equal to 10 K/m. surfaces P and Q are maintained at constant temperatures as shown in the fig. While the remaining part of the boundary is insulated. The body was a constant thermal conductivity of 0.1 W/mK, the value of $\partial T/\partial X$ and $\partial T/\partial y$ P at surface are
(a) $\partial T/\partial X$ = 20K/m,$\partial T/\partial y$ = 0 K/m
(b) $\partial T/\partial X$ = 0K/m, $\partial T/\partial y$ = 10 K/m
(c) $\partial T/\partial X$ = 10K/m, $\partial T/\partial y$ = 10 K/m
(d) $\partial T/\partial X$ = 0K/m, $\partial T/\partial y$= 20 K/m