Sides of a triangle are 9 cm, 6 cm and 5 cm. What is the value of circumradius of this triangle?

A

$$\frac{9\sqrt{3}}{4}$$

B

$$\frac{9\sqrt{3}}{5}$$

C

$$\frac{27\sqrt{2}}{8}$$

D

$$\frac{9\sqrt{2}}{2}$$