I'm doing a trailhead challenge and I got this wrong, but I can't figure why, or why the answer is what they said it should be.  Here is the question "As an account’s expiration approaches, send recurring email notifications to the owner (2 weeks before, 1 week before, 3 days before, and 1 day before).  What tool to use: Lightning Process Builder, Visual Workflow, Workflow, Approval"?

I said Visual Workflow, but apparently I was wrong ... it's Workflow.  Can anyone tell me why Visual Workflow would not work or why it is less preferred?  The content on that page provides no clue as far as I can tell (https://developer.salesforce.com/trailhead/business_process_automation/process_whichtool).

Thanks!
Dave

I'm doing a trailhead challenge and I got this wrong, but I can't figure why, or why the answer is what they said it should be.  Here is the question "As an account’s expiration approaches, send recurring email notifications to the owner (2 weeks before, 1 week before, 3 days before, and 1 day before).  What tool to use: Lightning Process Builder, Visual Workflow, Workflow, Approval"?

I said Visual Workflow, but apparently I was wrong ... it's Workflow.  Can anyone tell me why Visual Workflow would not work or why it is less preferred?  The content on that page provides no clue as far as I can tell (https://developer.salesforce.com/trailhead/business_process_automation/process_whichtool).

Thanks!
Dave