Which of the following functions F(x)F(x)F(x) satisfies F′(x)=2xF'(x) = 2xF′(x)=2x?
F(x)=x2+5F(x) = x^2 + 5F(x)=x2+5
F(x)=x2F(x) = x^2F(x)=x2
F(x)=2x2F(x) = 2x^2F(x)=2x2
F(x)=x2+CF(x) = x^2 + CF(x)=x2+C