Which of the following are the immediate commands in the event of decompression?

The correct response highlights critical actions necessary during an in-flight decompression situation. When a rapid loss of cabin pressure occurs, providing immediate access to supplemental oxygen is vital for passenger safety. The direction to put on oxygen masks, secure seat belts, and pull the mask firmly to activate the flow of oxygen ensures that everyone quickly receives the oxygen needed to compensate for the lack of breathable air.

This procedure is essential as it helps maintain a stable oxygen flow to the brain and other vital organs during a time when passengers might experience hypoxia due to lower atmospheric pressure. Prompt initiation of these actions can significantly mitigate the risks of unconsciousness and related complications, ensuring that individuals can remain conscious and safe during the emergency.

Other options may include useful actions in various emergency situations, but they do not prioritize the immediate need for oxygen supply, which is critical for survival in a decompression event.