You are the first firefighter to reach a person who has collapsed in a public park. They are unresponsive. Arrange the following actions in the correct logical sequence.
1. Check for breathing and a pulse.
2. Ensure the scene is safe for you to approach.
3. Begin chest compressions if no pulse is found.
4. Call for medical backup and an AED.
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A
1, 3, 4, 2
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B
2, 1, 4, 3
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C
4, 2, 1, 3
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D
2, 4, 1, 3