This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to conduct a time and motion study
Use work sampling if you have limited time to record.
In this approach, you observe the person at certain times rather than continuously. The intervals can be regular or random.

Pick from:
--These intervals apply to all records, and when recording something of particular value, such as checks or money transfers, timers may not apply. Again, during time processing, readings may only be used if things are clear.;
--You observe the person for a given time, and then extrapolate from the samples how much time is spent on each task. This type works better on tasks that have fewer components or workers that do fewer tasks overall.;
--If the time is minimal, then the person can give testimony. The judge may take notes from you during cross-examination.;
--Observe the individual as often as she spends time at her job. The same must be said for the person.;
The answer is:
You observe the person for a given time, and then extrapolate from the samples how much time is spent on each task. This type works better on tasks that have fewer components or workers that do fewer tasks overall.