RA and RB are two tangents from a common point ‘R’ outside the circle with centre ‘O’, having a radius of 6 cm. If ∠ARB = 70°, find the measure of the angle AOB.

A

$$130^{\circ}$$

B

$$110^{\circ}$$

C

$$120^{\circ}$$

D

$$80^{\circ}$$