Mary Lamb is an insurance sales representative. Her company has provided her with a laptop computer that uses wireless connectivity to access the accounting information system from virtually anywhere in the country. She has access to view customer and insurance product information. She also has access that allows her to enter and cancel customer orders. The permissions for Mary (and other sales reps) define a ________ in the company's database management system.

A. conceptual-level schema

B. external-level schema

C. physical view

D. data dictionary