A Troubled Adolescent Opened Fire in a High School Cafeteria

A troubled adolescent opened fire in a high school cafeteria, fatally shooting three people and injuring many others. Hundreds of parents come to the high school after hearing the news reports. After the police arrest the shooter, which action should occur next?

A) Ask the police to encircle the school campus with yellow tape to prevent parents from entering.
B) Announce over the loudspeakers, "The campus is now secure. Please return to your classrooms."
C) Require parents to pass through metal detectors and then allow them to look for their children in the school.
D) Designate zones according to the alphabet, and direct students to the zones based on their surnames to facilitate reuniting them with their parents.