Determine the location and value of the absolute extreme values of f on the given interval, if they exist:
f(x) = 3 sin^2 x on [0,̀π]
Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice. (Type an exact answer, using π as needed. Use a comma to separate answers as needed.)
A. The absolute minimum is at x =, but there is no absolute maximum.
B. The absolute maximum is at x =, but there is no absolute minimum.
C. The absolute minimum is at x = and the absolute maximum is at x =.
D. There are no absolute extreme values for f(x) on [0,π].