A process has an average throughput rate of 2 units an hour. The throughput ranges between 1.5 and 2.5 per hour. Once or twice a month on the days when the most experienced worker is operating the process and there are no interruptions during the process and when the input materials are just right, the process has a throughput rate of 3 units an hour. The machine designer says the actual capacity of the machine is 4 units an hour. According to our book, what should the operations manager state the current capacity (i.e., maximum sustainable throughput) of this process is:?

Group of answer choices

1.5 units per hour

2 units per hour

2.5 units per hour

3.0

4.0