Assertion (A): The torque about the point `3vec(i)-vec(j) + 3vec(k)` of a force represented by `4vec(i) + 2vec(j) + vec(k)` through the point `5vec(i) + 2vec(j) + 4vec(k)` is `vec(i) + 2vec(j)-8vec(k)`
Reason (R ): The torque of a force F about a point P is `vec(r ) xx vec(F )` where `vec(r )` is the vector from the point P to any point `vec(a)` on the line of action of `vec(F )` Which of the following is correct ?

Options

A. Both (A) and (R ) are true and (R ) is the correct explanation of (A)
B. Both (A) and (R ) are true and (R ) is not the correct explanation of (A )
C. (A) is true, (R ) is false
D. (A) is false, (R ) is true

Answer

A