Which of the following is a valid use case for a Business Rule in ServiceNow?

Business Rules are designed to trigger server-side actions (like field updates, workflow starts, or script execution) when database operations such as record updates occur.

Setting field values during a form load is typically a client-side action best handled by a Client Script, as Business Rules run on the server before or after a database operation, not directly during form rendering.

Modifying a field based on user input is a client-side action best handled by a Client Script, which can react immediately to changes on the form without server round trips.

While Business Rules can be used to create records, option A describes the fundamental triggering mechanism (responding to a record update) that is central to how Business Rules operate, making it a more direct use case for the rule itself.