A vertical spring with force constant K is fixed on a table. A ball of mass m at a height h above the free upper end of the spring falls vertically on the spring so that the spring is compressed by a distance d. The net work done in the process is:-

Question

( A ) $mg(h-d)+\frac{1}{2}Kd^2$
( B ) $mg(h-d)-\frac{1}{2}Kd^2$
( C ) $mg(h+d)+\frac{1}{2}Kd^2$
( D ) $mg(h+d)-\frac{1}{2}Kd^2$