A workflow must pause until an external approval system calls back, and the design should avoid polling while allowing the workflow to resume later. Which Workflows feature should be used?

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B. A callback endpoint. Workflows callbacks let an execution wait for another service to make a request to a callback endpoint, so the workflow can resume without polling. A sleep step can pause execution, but it is used for timed waiting or polling intervals rather than event-driven resumption from an external callback.

A workflow must pause until an external approval system calls back, and the design should avoid polling while allowing the workflow to resume later. Which Workflows feature should be used?

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