While an EMT Forms a Field Diagnosis on the Scene

While an EMT forms a field diagnosis on the scene of an emergency,how do the steps differ from the traditional approach to diagnosis?

A) The EMT forms a field diagnosis within the first few minutes of the call to formulate treatment as quickly as possible.
B) Due to the limited time spent with the patient, the EMT must rely on a differential diagnosis.
C) The EMT must rule in or out the most serious conditions associated with the patient's presentation.
D) The EMT does not have time to form a differential diagnosis and must rely on prior experience when treating a patient.