Please choose the correct ending to complete the given sentence: Health: [header] How to confirm a partial acl tear [title] Take note if you hear a' popping' noise when the injury happens. [step] Most people state that they hear a popping noise when the acl is injured. If you heard a' popping' or' snapping' noise when you experienced your injury, it is likely that your acl has been at least partially torn.

Ending1: [substeps] This indicates that the acl was likely cut open when you fell off the road. [title] Check if you have injured your arm in any way. Ending2: [substeps] You can be sure if your acl is compressed because it will make a popping noise. If your acl is compressed, it will not sound like a popping noise. Ending3: You should go to the doctor to get this diagnosis confirmed. [substeps] Though you will most likely be in pain, try to remember the exact sound your knee made. Ending4: [substeps] Sudden tears are often accompanied by a popping sound when the laceration is opened. However, if the tear is very large or feels very tender or very deep, it is likely the tear is torn.

Answer format: ending1/ending2/ending3/ending4