6.5. You have been asked to build one of the following systems:

a. a network-based course registration system for your university.

b. a Web-based order-processing system for a computer store.

c. a simple invoicing system for a small business.

d. an Internet-based cookbook that is built into an electric range or microwave.

Select the system that is of interest to you and develop an entity-relationship diagram that describes data objects, relationships, and attributes.