Find the absolute extrema if they exist, as well as all values of $x$ where they occur, for the function $f(x)=6x+\frac{192}{x^2}+4,$ where $x>0.$

Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice.

A$.$ The absolute minimum is $40,$ which occurs at $x=4.$

$($Round the absolute minimum to two decimal places as needed. Type an exact answer for the value of $x$ where the minimum occurs. Use a comma to separate answers as needed.$)$

B$.$ There is no absolute minimum.

Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice.

A$.$ The absolute maximum is which occurs at $x=$

$($Round the absolute maximum to two decimal places as needed. Type an exact answer for the value of $x$ where the maximum occurs. Use a comma to separate answers as needed.$)$

B$.$ There is no absolute maximum.