The sides AB, BC and AC of $$\triangle ABC$$ are 12 cm, 8 cm and 10 cm, respectively. A circle is inscribed in the triangle touching AB, BC and AC at D, E and F, respectively. The ratio of the lengths of AD to CE is:

A

5 : 7

B

3 : 5

C

10 : 7

D

7 : 3