I believe the answer is Observational study
In an observational study, the data input couldn't be controlled by researchers because it's relative to the subject.
This type of study usually being conducted in researchers that involve ethical measurement or Personal opinion.
Answer:
If the reason or explanation is not confidential and will not create legal liability
Explanation:
When presenting your reason or explanation in a bad news letter it is important that the details are given responsibly, without anyone being harmed by it and that there are no illegal factors related to the details and specifications. It is always important to be cautious with this type of message because it can involve factors that are beyond your control and the control of those who are listening to your reason or explanation.
In this regard, it is important to note that when presenting your reason or explanation in a bad news letter you should only be specific if the reason or explanation is not confidential and does not create legal liability.
Answer:
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5) PTO Request.