For the following function, find the intervals on which the function is increasing or decreasing.

$f(x)=2x^3+9x^2-24x+4$

List any interval$($s$)$ on which the function is increasing. Select the correct answer and, if necessary, fill in the answer box within your choice.

A$.$ The function is increasing on the interval$($s$)$

$($Type your answer in interval notation. Use a comma to separate answers as needed.$)$

B$.$ The function is never increasing.

List any interval$($s$)$ on which the function is decreasing. Select the correct answer and, if necessary, fill in the answer box within your choice.

A$.$ The function is decreasing on the interval$($s$)$

$($Type your answer in interval notation. Use a comma to separate answers as needed.$)$

B$.$ The function is never decreasing.