Final answer:
In an emergency evacuation, all staff should meet at a designated assembly point outside the building to ensure safety and proper accountability.
Step-by-step explanation:
In an emergency evacuation situation, it is crucial that all staff meet at a designated assembly point outside the building. This is to ensure that everyone is safely accounted for and to allow emergency services to manage the situation without obstruction. The assembly point should be clearly marked and all staff should be familiar with its location. It is not correct to meet in the cafeteria or stay in their respective offices during such emergencies. The correct answer to the question is C) At a designated assembly point outside the building.