What is the primary use of telephone jacks in a high-rise building during emergencies?

The primary use of telephone jacks in a high-rise building during emergencies is for communication during evacuations. In emergency situations, maintaining clear lines of communication is essential for coordinating evacuation efforts, informing occupants about safety procedures, and relaying critical information to emergency responders. Telephone jacks facilitate this by providing access to landline communication, which can be more reliable than mobile phones during power outages or network failures. This ensures that those responsible for managing the emergency can effectively guide occupants and ensure their safety.

While the other options might have some relevance in different contexts, they do not align with the critical emergency communication role that telephone jacks serve in high-rise buildings. The focus on communication is paramount for effective emergency management and response.