Differentiate.
f(x)=(1)/(4x²-8)
A. f'(x)=-(1)/((4x²)-8)²
B. f'(x)=-(8x-8)/((4x²-8)²
c. f'(x)=-(8x)/(4x²-8)
D. f'(x)=-(8x)/((4x²-8)²