Selecting an automation to populate the Entry Source Data Extension is what the marketer should do in order to run a journey multiple times a day after new data is compiled. This option allows the marketer to use an automation that imports or updates data in a data extension and then use that data extension as an entry source for a journey. The automation can be scheduled to run multiple times a day and trigger the journey accordingly. Selecting the Recurring schedule type for the entry source in Journey Builder would not work if the data is not in an attribute group in Contact Builder. Scheduling and activating Triggered Sends for the messages in the journey would not work if the marketer wants to use other journey activities besides sending emails.