Dipoles, whether electric or magnetic, are characterised by their dipole moments, which are vector quantities. Two equal and opposite charges separated by a small distance constitute an electric dipole, while a current carrying loop behaves as a magnetic dipole. Electric dipoles create electric fields around them. Electric dipoles experience a torque when placed in an external electric field. (i) Two identical electric dipoles, each consisting of charges $-q$ and $+q$ separated by distance $d$, are arranged in x-y plane such that their negative charges lie at the origin $O$ and positive charges lie at points $(d, 0)$ and $(0, d)$ respectively. The net dipole moment of the system is : (A) $-qd$\hat{i} + \hat{j}$$ (B) $qd$\hat{i} + \hat{j}$$ (C) $qd$\hat{i} - \hat{j}$$ (D) $qd$\hat{j} - \hat{i}$$