The trade magazine QSR routinely checks the drive-through service times of fast-food restaurants. An 80% confidence interval that results from examining 634 customers in Taco Bell's drive-through has a lower bound of 168.3 seconds and an upper bound of 172.1 seconds. Complete parts (a) through (c). (a) What is the mean service time from the 634 customers? The mean service time from the 634 customers is seconds (Type an integer or a decimal. Do not round.). (b) What is the margin of error for the confidence interval? The margin of error is seconds. (Type an integer or a decimal. Do not round.) (c) Interpret the confidence interval. Select the correct choice below and fill in the answer boxes to complete your choice. (Type integers or decimals. Do not round.) OA. There is a OB. One can be OC. One can be OD. The mean drive-through service time of Taco Bell is % probability that the mean drive-through service time of Taco Bell is between % confident that the mean drive-through service time of Taco Bell is % confident that the mean drive-through service time of Taco Bell is between seconds % of the time. seconds and seconds. seconds and seconds seconds.