$A$ force $F_1 = A \hat{j}$ is applied to a point whose radius vector is $r_1 = a \hat{i}$,while a force $F_2 = B \hat{i}$ is applied to the point whose radius vector is $r_2 = b \hat{j}$. Both the radius vectors are determined relative to the origin of the coordinate axes $O$. The moment of the force relative to $O$ is
- A$(a A - b B) \hat{k}$
- B$(a A - b B) \hat{j}$
- C$(a b - A B) \hat{k}$
- D$(a B - b A) \hat{j}$
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