Find the absolute extremum, if any, for the following function. f(x) = 4x3 - 7 Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice. O A. The absolute minimum Is at x = O B. There is no absolute minimum. Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice O A. The absolute maximum is at x= O B. There is no absolute maximum