3 solid cubes whose sides are 3 m, 4 m and 5 m, respectively, are melted to form a new cube. The total surface area of the new cube will be _______.

A

215 $$m^{2}$$

B

115 $$m^{2}$$

C

216 $$m^{2}$$

D

116 $$m^{2}$$