The coordinates of the point `P` on the line ` vec r=( hat i+ hat j+ hat k)+lambda(- hat i+ hat j- hat k)` which is nearest to the origin is a. `(2/4,4/3,2/3)` b. `(-2/3,-4/3,2/3)` c. `(2/3,-4/3,2/3)` d. none of these