A patient told his doctor that he has pain in his leg and that his ankle is swollen. The patient also mentioned that he had a fever the other day. Which statement best explains why the doctor needs to know the date on which each symptom occurred? It makes the documentation easier to transfer into electronic form. It allows other health-care workers to treat the patient. It helps the doctor determine whether one symptom was caused by another. It provides health insurance companies with the required information.