; (B) the head of facility who authorized the lockdown complied with all notification requirements, and received approval from the agency regional or field office, or equivalent office responsible for oversight of the facility, at the time the lockdown lasted longer than 4 hours; (C) the head of the applicable Federal agency approved of the lockdown if the lockdown exceeded 8 hours and the approval occurred at that time; (D) the lockdown was ended as quickly as possible, did not last longer than necessary to address the unexpected, extraordinary circumstances, and did not exceed 24 hours