QuestionFor the quadratic function $f(x)=x^{2}+2 x+1$, answer parts (a) through ( $f$ ).
Is the graph concave up or concave down?
Concave down (Type your answer in interval notation.) (f) Determine where $f(x)>0$ and where $f(x)<0$. Select the correct cholce below and fill in the answer box(es) within your choice. (Type your answer in interval notation. Use integers or fractions for any numbers in the expression.) A. $f(x)>0$ on $\square$ and $f(x)<0$ on $\square$ B. $f(x)<0$ on 0 and $f(x)$ is never positive C. $f(x)>0$ on $\square$ and $f(x)$ is never negative