If $$t_1$$ and $$t_2$$ are the times of flight of two particles having the same initial velocity $$u$$ and range $$R$$ on the horizontal, then $$t_1^2 + t_2^2$$ is equal to

A

$$\frac{u^2}{g}$$

B

$$\frac{4u^2}{g^2}$$

C

$$\frac{u^2}{2g}$$

D

$$1$$