To schedule a pipeline to run every four hours on specific days, what setting should be used?

To schedule a pipeline to run every four hours specifically on certain days, the weekly scheduling option is most appropriate. This setting allows you to define specific days of the week on which the pipeline should execute. By selecting this option, you can set up the schedule to run four times a day (every four hours) while restricting it to run only on the designated days you choose, such as Monday, Wednesday, and Friday.

The other scheduling options either do not provide the necessary granularity or are not applicable for this requirement. For instance, a daily schedule would not allow for skips on certain days, and an hourly schedule would run every hour, not limited to specific days. Scheduling by the minute would also not meet the requirement as it allows scheduling every minute without any day restrictions, which is beyond what is needed in this scenario.