Which expression represents the integral ∫4x3dx\int 4x^3 dx∫4x3dx?
x4+Cx^4 + Cx4+C
12x2+C12x^2 + C12x2+C
43x4+C\frac{4}{3}x^4 + C34x4+C
4x4+C4x^4 + C4x4+C