not satisfied. $($Select all that apply.$)$

$($a$)x=-5$

$f$ is continuous.

$\underset{x-5}{lim}f(x)$ does not exist.

$f(-5)$ does not exist

$\underset{x-5}{lim}f(x)f(-5)$

$($b$)x=0$

$f$ is continuous.

$\underset{x0}{lim}f(x)$ does not exist.

$f(0)$ does not exist

$\underset{x0}{lim}f(x)f(0).$