Answer the questions on the basis of the information given below.From a point D outside a circle, two tangents DA and DB are drawn as shown in the figure given below. It is also given that AC = CB, where point C lies on the given circle, AB = 2 cm and the measure of ∠ACB is 30°.If the measure of ∠ADB is ‘k’ times the measure of ∠ACB, then what is the value of ‘k’?

1) 1
2) 3
3) 4
4) 2.5
5) 5