Three forces acting on a body are shown in the figure. To have the resultant force only along the $y$ - direction, the magnitude of the minimum additional force needed is :

Question

$\begin {array} {1 1} (1)\;\sqrt 3\: N & \quad (2)\;0.5\: N \\ (3)\;1.5\: N & \quad (4)\;\large\frac{\sqrt 3}{4}\: N \end {array}$