Find the volume of a right circular cone with height 12 and a base with radius 6. What is the definite integral that represents the volume?
a) ∫[0 to 12] π(6/12)²h dh
b) ∫[0 to 6] πr² dr
c) ∫[0 to 2π] π(6cosθ)²(6sinθ) dθ
d) None of the above