In triangle $$PQR, C$$ is the centroid. $$PQ$$ = 30 cm, $$QR$$ = 36 cm and $$PR$$ = 50 cm. If $$D$$ is the midpoint of $$QR$$, then what is the length (in cm) of $$CD$$?

A

$$\frac{(4\surd86)}{3}$$

B

$$\frac{(2\surd86)}{3}$$

C

$$\frac{(5\surd86)}{3}$$

D

$$\frac{(5\surd86)}{2}$$