When it comes to evacuation, how is a two-stage alarm different from a one-stage alarm?

The distinction of a two-stage alarm lies in the way it communicates different levels of urgency through varied auditory signals. In a two-stage system, each stage typically has a distinct sound that conveys specific instructions: one sound might signal an alert that requires heightened awareness, while a different sound indicates a full evacuation. This differentiation helps occupants understand the appropriate response required at each stage without confusion.

Having varied auditory signals is crucial in emergency situations; it allows for quick recognition of the situation's severity and facilitates a more organized evacuation process. This clarity can significantly reduce panic and chaos during an emergency situation, as individuals can clearly discern whether they need to prepare to evacuate or stay alert for further instructions.

The other options, while they may also describe potential features of alarm systems, do not capture the essence of how a two-stage alarm communicates urgency through distinct sounds effectively. Thus, the answer highlighting different sounds for evacuation versus alert accurately represents the core functionality of a two-stage alarm system.