Which type of webhooks must be configured to receive all the events that relate to a specific system?

Broadwork is not a recognized webhook type in standard or Cisco Webex webhook terminology.

Broadcast is not a standard webhook classification - it refers to a network transmission type, not a webhook configuration category.

Fallback webhooks serve as a catch-all destination for events that cannot be delivered to their primary target, not a mechanism for subscribing to all events.

A firehose webhook delivers every event that occurs on a platform to the configured endpoint, without any resource or event-type filtering applied. This is distinct from targeted webhooks that only send events matching specific criteria such as a particular room or resource. Firehose webhooks are used when an application must capture or log every activity occurring within the system.