What is the exponential form of the expression (5³)(5³)(5³) * c³ * (5³)ᶜ⁶?
A) 5ᶜ^(3 + 3 + 3) * c¹8
B) 5³c⁶
C) 5⁹c¹8
D) 5ᶜ^(9 + 6)