You need to drop off a registered letter at a post office. When you get your ticket to stand in line, the display board indicates that you will beserved in around 12 minutes. Only 6 of the 10 counters are open. The last customer who has just been called to the counter had the ticketnumber 611. You have ticket no. 636.

Which of the following statements below is true?

a. According to Little's Law, the 12-minute waiting timecorresponds to the throughput time. b. If more people enter thepost office than leave it, the waiting time increases, but not the cycle time. c. If 3 more counterswere open, your waiting time would be reduced by half, which means 6 minutes. d. In the system are waiting 25 people. e. Running the system with tickets significantlyreduces the waiting time for customers.