AB is the diameter of a circle with centre O. C and D are two points on the circle on either side of AB, such that $$\angle CAB = 52^{\circ}$$ and $$\angle ABD = 47^{\circ}$$. What is the difference (in degrees) between the measures of $$\angle$$ CAD and $$\angle$$ CBD?

A

10

B

25

C

15

D

20