In $$\triangle$$ABC, D and E are the points on sides AC and AB,respectively such that $$\angle$$ADE = $$\angle$$B. If AE = 8 cm, CD=3 cm, DE = 6 cm and BC = 9 cm, then AD is equal to:

A

9 cm

B

7.5 cm

C

6 cm

D

8 cm