What is the primary function of a 'muster point' or 'assembly point' during an emergency evacuation?

1. A location where emergency responders can park their vehicles and set up command.
2. A designated safe area where all occupants should gather after evacuating a building for roll call and further instructions.
3. A designated area for storing emergency supplies and first aid equipment.
4. A secure room within the building where essential personnel can shelter during an emergency.