PA and PB are two tangents to a circle with centre $$O$$, from a point $$P$$ outside the circle. $$A$$ and $$B$$ are points on the circle. If $$\angle OAB = 20^\circ$$, then $$\angle APB$$ is equal to:

A

$$20^\circ$$

B

$$25^\circ$$

C

$$40^\circ$$

D

$$50^\circ$$