What is the horizontal asymptote of f(x)=3x2+1x2+2x+1f(x) = \frac{3x^2+1}{x^2+2x+1}f(x)=x2+2x+13x2+1?
y=0y=0y=0
y=3y=3y=3
y=1y=1y=1
None