Which function is equivalent to h(x)=3x^2-108?

A. k(x)=3(x-6)(x+6)
B. k(x)=(3x-2)(x+54)
C. K(x)=3(x+6^2
D. K(x)=3(x-6(^2

The correct answer is A. k(x)=3(x-6)(x+6).