The total surface area of a solid metallic hemisphere is 462 $$cm^{2}$$. This is melted and moulded into a right circular cone. If the radius of the base of the cone is the same as that of the hemisphere, then its height is: (use $$ \pi = \frac{22}{7}$$)

A

14 cm

B

7 cm

C

21 cm

D

28 cm