The Attribute(s) That Make Up a Foreign Key in a Relation

Multiple Choice

The attribute(s) that make up a foreign key in a relation of a database ____.

A) cannot appear in another relation of the database
B) may or may not appear in another relation of the database
C) must appear in another relation of the database
D) must have unique values in the relation in which it is a foreign key
E) must be part of the primary key in the relation in which it is a foreign key