Which are valid reasons to stop CPR?

Stopping CPR is a critical decision that must be made based on the circumstances at hand, and all the listed reasons are indeed valid for stopping CPR.

When the scene becomes unsafe, continuing to administer CPR could put the rescuer's life at risk. Rescuers must prioritize their safety to ensure they can help others effectively.

The arrival of emergency personnel signals that trained professionals are now present to take over the care of the victim. CPR should be halted so that these skilled individuals can perform their duties without interruption.

Fatigue is another crucial reason. If a rescuer becomes too tired to perform effective chest compressions or maintain the proper technique, their effectiveness diminishes dramatically. Proper CPR requires physical strength and efficiency, so if a rescuer cannot continue, it's essential to stop and either pass on the responsibility or allow someone else to take over.

Given that all these conditions justify the cessation of CPR, choosing all options as correct reflects a comprehensive understanding of when it's appropriate to stop providing this life-saving assistance.