In the given figure, PT is a common tangent to three circles at points A, B and C respectively. The radius of the small, medium and large circles is 4 cm, 6 cm and 9 cm. $$O_1, O_2$$ and $$O_3$$ are the centre of the three circles. What is the value (in cm) of PC?

A

$$18\surd6$$

B

$$9\surd6$$

C

$$24\surd6$$

D

$$15\surd6$$