Which of the following includes all of the requirements for an oxygen system to be approved for emergency use in the United States?

A compliant manufacturing standard is essential for an oxygen system to be approved for emergency use in the United States. This entails that the equipment must adhere to specific regulatory guidelines set forth by the relevant authorities, such as the Food and Drug Administration (FDA) and possibly other safety standards. These standards ensure that the oxygen system is reliable, safe, and effective for emergency situations, which is crucial in saving lives.

While a valid prescription is necessary for certain medical devices or medications, and a tracking system may be beneficial for inventory purposes, they are not universally required for the approval of an oxygen system for emergency use. Thus, compliance with manufacturing standards is the critical factor that ensures the oxygen system meets safety and efficacy requirements mandated by regulatory bodies.