What must occur after the "All Clear" announcement is made?

Answer
The correct option is b: A mandatory debriefing within 72 hours. In hospital emergency protocols, especially concerning critical incidents like a missing child or facility threats, an "All Clear" announcement is followed by a required post-incident review or debriefing within a specified timeframe (typically 72 hours) to evaluate the response, identify areas for improvement, and provide support to staff.