Which of the Following Actions Explains Mass Customization

Which of the following actions explains mass customization?

A) Firms tailor their products and services to meet a customer's particular needs on a large scale.
B) Firms provide immediate communication and feedback to and from customers.
C) Firms provide ways for clients and firms to conduct business online without human assistance.
D) Firms market their products and services over vast distances.
E) Firms link Web sites to corporate databases to provide real-time access to personalized information.