Sides of a triangle are 12 cm, 9 cm and 9 cm. What is the radius of the circumcircle of this triangle?

A

$$\frac{181}{\surd{5}}$$

B

$$\frac{27}{\surd{5}}$$

C

$$\frac{(27\surd{5})}{10}$$

D

$$\frac{54}{\surd{5}}$$