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

$f(x)=2x^3-3x^2-72x+18$

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.