For the function f(x)=4x^2, compute the difference quotient: (f(x+h)-f(x))/(h) = [ color 1]. What is the difference quotient for the given function?
A) (4(x+h)^2 - 4x^2)/(h)
B) (4(x+h)^2 - 4x^2)/h
C) (4x^2 + 4h^2 - 4x^2)/h
D) (4x^2 + 4h^2 - 4x^2)/(h^2)