1. A Non-key Attribute

A) should not be repeated in another table.

B) is also a foreign key in another table.

C) must be unique within that table.

D) is also a primary key in another table.

2. A foreign key

A) must be either null or a primary key in another table.

B) must be a primary key in another table and cannot be null.

C) may be a primary key or a non-key attribute in another table.

D) may be a non-key attribute in another table and cannot be null.

3. A primary key may be made up of more than one field joined together.

A) True

B) False