For a free body diagram shown in the figure, the four forces are applied in the '$$x$$' and '$$y$$' directions. What additional force must be applied and at what angle with positive $$x$$-axis so that the net acceleration of body is zero?

A

$$\sqrt{2} \text{ N}, 45°$$

B

$$\sqrt{2} \text{ N}, 135°$$

C

$$\dfrac{2}{\sqrt{3}} \text{ N}, 30°$$

D

$$2 \text{ N}, 45°$$