$f(x)=\frac{x}{\sqrt[\phantom{2}]{x-6}}on8,24$

a$.$ Identify all the critical points on the given inferval. Select the correct choice below and, if necessary, fill in the answer box to complete your choice.

A$.$ The critical point$($s$)$ occur$($s$)$ at $x=12.$

$($Use a comma to separate answers as needed.$)$

B$.$ There are no critical points for $f.$

b$.$ Identify the absolute minimum$/$minima of the function on the given interval. Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice.

A$.$ The absolute minimum$/$minima is$/$are $$ and occur$($s$)$ at $x=8.$

$$

$($Type exact answers, using radicals as needed. Use a comma to separate answers as needed.$)$

B$.$ There is no absolute minimum.