Suppose f$($x$)$ is continuous at x$=9,$ f$(9)=3,$ and f$(9)=1.$ Select all statements that must be true.

Select all that apply:

f$($x$)$ is differentiable at x$=9.$

limx$3$f$($x$)=9.$

limx$9$f$($x$)=3.$

None of the above.