When you have a custom dashboard that has only one widget, you can delete that widget by clicking the Delete Widget button on the widget properties panel. This will remove the widget from the dashboard, but it will not delete the dashboard itself. You can still view and edit the dashboard from the Controller UI or the Events Service.
According to the Create and Manage Custom Dashboards and Templates - AppDynamics, when you delete a widget from a custom dashboard, AppDynamics does not create a blank widget because empty dashboards are not allowed. Instead, it preserves the existing widgets on the dashboard and displays them in a single row.
Therefore, B (The widget is deleted, but an empty custom dashboard is maintained) is true. References:
Create and Manage Custom Dashboards and Templates - AppDynamics
How to bulk delete custom dashboards using API - Cisco … - AppDynamics
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