The Three Commonly Used Terms to Describe Levels of Service

The three commonly used terms to describe levels of service are

A) self-service, limited-service, and full-service.
B) retailer-service, sales-service, and customer-service.
C) self-service, automated-service, and online-service.
D) limited-service, full-service, and automated-service.
E) wholesaler-service, retailer-service, and customer-service