Answer:
Flow time refers to the time it takes for a process or task to be completed. In the context of the given question, the typical units for flow time are:
D. Hours
Hours are commonly used to measure flow time because they provide a practical and meaningful way to track the duration of a process or task. For example, if you are measuring the flow time of a manufacturing process, you would likely use hours to quantify the time it takes for a product to be produced from start to finish.
On the other hand, the other options provided in the question do not typically represent units for flow time:
A. Bytes: Bytes are used to measure data storage, not time.
B. Years: Years are used to measure long periods of time, such as the age of a person or the duration of a historical event. While it is possible to use years to measure flow time in some specific contexts, it is not a typical unit for this purpose.
C. Dollars: Dollars are used to measure monetary value, not time.
Therefore, the correct answer is D. Hours.