Section 3
(Answer all questions in this section)

  1. Relationships always exist between

3 or more entities

2 entities (or one entity twice)

2 attributes

3 or more attributes


  2. In a business that sells computers, choose the best relationship name from CUSTOMER to ITEM (computer, in this case).

Each CUSTOMER must be the buyer of one or more ITEMS.

Each CUSTOMER must be the seller of one or more ITEMS.

Each CUSTOMER may be the maker of one or more ITEMS.

Each CUSTOMER may be the producer of one or more ITEMS.


  3. Relationships can be either mandatory or optional. True or False?

True

False


  4. What are the three properties that every relationship should have?

Transferability, degree, name

Name, optionality, degree

A UID bar, a diamond, an arc

Name, optionality, arcs