QuestionComplete the sentence below. If $f^{-1}$ denotes the inverse of a function $f$, then the graphs of $f$ and $f^{-1}$ are symmetric with respect to the line $\qquad$ .
If $f^{-1}$ denotes the inverse of a function $f$, then the graphs of $f$ and $f^{-1}$ are symmetric with respect to the line $\square$ $$\begin{array}{l} y=x^{2} \\ y=x+1 \\ y=x \\ y=x^{2}+1 \end{array}$$