Find the intervals on which the function is increasing or decreasing.
f(x) = 2x^3 + 3x^2 - 12x + 7
List any interval(s) on which the function is increasing. Select the correct answer below 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.