A plum is located at coordinates (-2.0 m, 0, 4.0 m). In unit-vector notation, what is the

Question:

A plum is located at coordinates (-2.0 m, 0, 4.0 m). In unit-vector notation, what is the torque about the origin on the plum if that torque is due to a force F whose only component is?
(a) F x = 6.0 N,
(b) F x = -6.0 N,
(c) F z = 6.0 N, and
(d) F z = -6.0 N?