Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to check someone's breathing rate (rate of respiration ) [title] Count the breaths. [step] Breathing is measured in breaths per minute or bpm. To get an accurate measurement, the person must be at rest.

Ending1: [substeps] If the person is already resting, press the count button on the bottom left corner of their screen. You'll notice a circular icon with an arrow going down the right side and a timer going on. Ending2: This means she is not breathing faster than usual due to exercising. She should be still for at least 10 minutes before you count her breaths. Ending3: If the person is fatigued, he or she is likely to record his or her breaths so he or she can track them. [title] Look for unevenness in inhalation or exhalation. Ending4: To count the rate of exhalation, the person must be sitting, standing, or lying down. The woman with the child must be comfortably supported, her head turned backwards and her chin pulled down to avoid straining her chest.

Answer format: ending1/ending2/ending3/ending4