Customer-Response Time (CRT) Is Usually Defined As

Customer-response time (CRT) is usually defined as:

A) The time between when a customer places an order and the time when the order is received by the customer.
B) The elapsed time between initial customer contact and the time a customer places an order.
C) The time between when a customer places an order and when that order is manufactured.
D) The time between when an order is started into production and when that order is completed.
E) The time it takes to respond to customer inquiries.