Suppose the function A(x)=0.003257x3 -0.03741x2 +0.1349x+0.008 approximates the blood alcohol concentration in a person's bloodstream x hours after drinking 2 ounces of alcohol on an empty stomach, for x in the interval [0,4]. (a) On what time intervals is the blood alcohol concentration increasing? Interpret your results. (b) On what intervals is it decreasing? Interpret your results. (a) Determine the interval(s), if any, on which the blood alcohol concentration is increasing. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. The blood alcohol concentration is increasing on the time interval(s) (Type your answer in interval notation. Use integers or decimals for any numbers in the expression. Round to the nearest hundredth as needed. Use a comma to separate answers as needed.) OB. The blood alcohol concentration is never increasing. 13