From a point $$P$$ outside the circle with centre $$O$$. two tangents $$PA$$ and $$PB$$ are drawn to meet the circle at $$A$$ and $$B$$ respectively. If $$\angle APB = 70^\circ$$. then $$\angle OAB$$ is equal to:

A

$$35^\circ$$

B

$$65^\circ$$

C

$$45^\circ$$

D

$$55^\circ$$