A smooth sphere is moving on a horizontal surface with velocity vector `3hati+hatj` immediately before it hits a vertical wall. The wall is parallel to the vector `hatj` and the coefficient of restitution between the wall and the sphere is `1//3`. The velocity vector of the sphere after it hits the wall is :
A. `3hati-1/3 hatj`
B. `-hati+hatJ`
C. `hati-hatj`
D. `-hati-1/3hatj`
