An unbiased dice is tossed seven times. Find the probability of getting a third six on the seventh throw.

A

$$\frac{\left(^6C_2\times\ 5^2\right)}{6^7}$$

B

$$\frac{\left(^6C_2\times\ 5^4\right)}{6^7}$$

C

$$\frac{\left(^6C_3\times\ 5^3\right)}{6^7}$$

D

$$\frac{\left(^7C_3\times\ 5^4\right)}{6^7}$$