Emergency room employees select and see patients in an order based on the patients' need for treatment. Victims who have life-threatening injuries are seen ahead of those with minor complaints like an ingrown toenail or a case of poison ivy. Emergency rooms differentiate their waiting customers on the basis of:
A. Willingness to perform service role
B. Importance of the customer
C. Duration of the service transaction
D. Urgency of the job
E. Payment of a premium price
Answer: D. Urgency of the job