There are two circles which touch each other externally. The radius of the first circle with centre O is 17 cm and radius of the second circle with centre A is 7 cm. BC is a direct common tangent to these two circles, where B and C are points on the circles with centres O and A, respectively. The length of BC is:

A

$$2\sqrt{118}$$

B

$$2\sqrt{119}$$

C

$$2\sqrt{113}$$

D

$$2\sqrt{117}$$