JEE Physics Practice Question

The angle between vector $$\vec{Q}$$ and the resultant of $$(2 \vec{Q}+2 \vec{P})$$ and $$(2 \vec{Q}-2 \vec{P})$$ is :

1. A.$$ \tan ^{-1}(\mathrm{P} / \mathrm{Q}) $$
2. B.0$$^\circ$$
3. C.$$ \tan ^{-1} \frac{(2 \vec{Q}-2 \vec{P})}{2 \vec{Q}+2 \vec{P}} $$
4. D.$$ \tan ^{-1}(2 Q / \mathrm{P}) $$