If speed of light $$c$$, Planck's constant $$h$$ and gravitational constant $$G$$ are chosen as fundamental quantities, dimensions of time in this system of units is

A

$$ch^{3/2} G^{3/2}$$

B

$$c^{-2} G^{1/2} h$$

C

$$c^2 G^{1/2} h^{5/2}$$

D

$$c^{-5/2} G^{1/2} h^{1/2}$$