Read the following case study, which describes the data requirements for a DVD rental company.

The DVD rental company has several branches throughout the United States. The data held on each

branch is the branch address made up of street, city, state, and zip code, and the telephone number. Each

branch is given a branch number, which is unique throughout the company. Each branch is allocated

staf , which includes a Manager. The Manager is responsible for the day-to-day running of a given

branch. The data held on a member of staf is his or her name, position, and salary. Each member of staf

is given a staf number, which is unique throughout the company. Each branch has a stock of DVDs. The

data held on a DVD is the catalog number, DVD number, title, category, daily rental, cost, status, and the

names of the main actors and the director. The catalog number uniquely identifies each DVD. However, in

most cases, there are several copies of each DVD at a branch, and the individual copies are identified

using the DVD number. A DVD is given a category such as Action, Adult, Children, Drama, Horror, or

Sci-Fi. The status indicates whether a specific copy of a DVD is available for rent. Before borrowing a

DVD from the company, a customer must first register as a member of a local branch. The data held on a

member is the first and last name, address, and the date that the member registered at a branch. Each

member is given a member number, which is unique throughout all branches of the company. Once

registered, a member is free to rent DVDs, up to a maximum of ten at any one time. The data held on each

DVD rented is the rental number, the full name and number of the member, the DVD number, title, and

daily rental, and the dates the DVD is rented out and returned. The DVD number is unique throughout the

compan