If $$G$$ is the G.M. of the product of $$r$$ sets of observations with geometric means $$G_1,G_2,G_3,.....G_r$$ respectively, then find the value of $$G$$?

A

$$\log G_1 + \log G_2 + .......\log G_r$$

B

$$G_1.G_2.........G_r$$

C

$$G_1 + G_2 + ..........+G_r$$

D

$$\log G_1 . \log G_2 . .......\log G_r$$