Which of the following functions F(x)F(x)F(x) is an antiderivative of f(x)=ex+1f(x) = e^x + 1f(x)=ex+1?
ex+1e^x + 1ex+1
ex+xe^x + xex+x
ex+x2e^x + x^2ex+x2
12ex+x\frac{1}{2}e^x + x21ex+x