Which of the following is NOT a characteristic of a confined space?

A well-ventilated and open atmosphere is not a characteristic of a confined space because confined spaces are defined primarily by their limited access, restricted airflow, and the potential hazards that can accumulate within them. Confined spaces typically have limited means for entry and exit, which can hinder quick evacuation in emergencies.

Additionally, these spaces often present risks such as the potential for a hazardous atmosphere, which can include toxic gases or low oxygen levels, and they must be large enough for a worker to enter and perform tasks. The characteristics that define confined spaces are crucial for understanding safety protocols and risk management when working in such environments, making option A the correct answer as it contradicts the fundamental nature of confined spaces.