Which is the antiderivative of f(x)=4x3f(x) = 4x^3f(x)=4x3?
x4+Cx^4 + Cx4+C
12x2+C12x^2 + C12x2+C
43x4+C\frac{4}{3}x^4 + C34x4+C
x4x^4x4