$3\mathrm{.}1$ Limits

If $\underset{x3}{lim}f(x)=6$ and $\underset{x{3}^{}}{lim}f(x)=5,$ then $\underset{x3}{lim}f(x).$ Explain your choice.

$($a$)$ Is $5$

$($b$)$ is $6$

$($c$)$ Does not exist

$($d$)$ is infinite