Four charge $Q_1, Q_2, Q_3$, and $Q_4$, of same magnitude are fixed along the $x$ axis at $x=-2 a-a,+a$ and $+2 a$, respectively. A positive charge $q$ is placed on the positive $y$ axis at a distance $b>0$. Four options of the signs of these charges are given in List-I. The direction of the forces on the charge q is given in List-II Match List1 with List-II and select the correct answer using the code given below the lists.