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A BUMPING action typically refers to a situation in a workplace where an employee can displace or "bump" another employee in a position due to various reasons such as seniority or other policies. In the context of firefighting and emergency services, this may apply to personnel shifts or assignments.

The correct answer indicates that a BUMPING action expires at the END of the shift. This is significant because it aligns with the operational structure in emergency services where shifts have defined start and end times. Once the shift concludes, any Temporary adjustment made through the BUMPING action ceases to be in effect, returning assignments to the original personnel. This ensures that roles are clearly defined and that all personnel know their duties for the next shift.

Understanding the timing of BUMPING actions is crucial for maintaining order and clarity in personnel management within fire services, ensuring that everyone is aware of who is responsible for what tasks at any given time.