Which action is critical when responding to a fire alarm in a high-rise building?

Establishing a clear communication plan is essential when responding to a fire alarm in a high-rise building due to the complexities involved in these environments. High-rise buildings present unique challenges such as multiple floors, potential smoke and heat conditions, and the need for coordination among various responding units.

Communication is vital to ensure that all personnel are aware of the situation, understand their roles, and can share critical information about the conditions in the building and the location of the fire. A well-established communication plan allows for efficient operations, supports the safety of both firefighters and occupants, and aids in coordinating evacuation procedures and fire suppression efforts.

Considering the other choices, proceeding directly to the fire floor without adequate information could lead to dangerous situations, as conditions may be more severe than anticipated. Checking the elevator for safety is important but might not be the first priority when immediate communication among units is required. Turning off all utilities may be necessary but typically would follow after assessments have been completed to determine the safest course of action. Therefore, having a clear communication plan fundamentally supports effective incident management in high-rise fire situations.