Which of the following describes how oxygen can be delivered to a patient?

The choice indicating that oxygen can be delivered through a nasal cannula, mask, or concentrator is correct because it encompasses a variety of delivery methods that are commonly used in healthcare settings to provide supplemental oxygen to patients.

A nasal cannula is a device that consists of two small tubes that fit into the nostrils, delivering a steady flow of oxygen directly to the nasal passages. This method is often preferred for patients who require lower flow rates and allows for ease of eating and speaking while receiving oxygen.

A mask delivers oxygen over the mouth and nose, providing a higher concentration of oxygen, which is beneficial for patients who need more significant respiratory support.

An oxygen concentrator is a device that takes ambient air and concentrates the oxygen, providing a continuous supply for patients who may require long-term oxygen therapy. This provides an effective and portable means to deliver oxygen in both inpatient and outpatient settings.

The other methods listed do not fully capture the range of oxygen delivery systems recognized in medical practice. For example, delivering oxygen solely through a mask does not reflect the versatility of other available options, such as nasal cannulas or concentrators, which can have specific advantages depending on patient needs and circumstances.