Which of the following is covered in NFPA 72 Chapter 23?

NFPA 72 Chapter 23 specifically focuses on protected premises alarm and signaling systems. This chapter provides guidelines and requirements regarding alarm systems installed in buildings, which notify occupants of emergencies such as fire or security breaches. The chapter encompasses various aspects of these systems, including installation, operation, and maintenance requirements.

The emphasis on protected premises in this chapter is crucial because these systems are essential for ensuring that alarms effectively alert occupants and enable timely response in case of emergencies. The guidelines serve to standardize how these systems are designed and implemented, ensuring safety and reliability in residential, commercial, and industrial environments.

While other options like supervising station alarm systems and emergency evacuation planning are important topics within NFPA 72, they fall under different chapters that address those specific functions and requirements. Therefore, the distinct focus of Chapter 23 on protected premises alarm and signaling systems clearly identifies it as the correct answer.