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The x – y plane is the plane of a couple of 25 Nm magnitude and $\hat{i}, \hat{j} , \hat{k}$ are unit vectors along x, y, and z directions respectively. Which one of the following represents the couple vector?

 (a) $\frac{25}{12}\hat{i}+\frac{25}{12}\hat{j}$ Nm

(b) 25 $\hat{i}$

(c)  25 $\hat{j}$

(d)  25 $\hat{k}$

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