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

Question $13$ options:

$1)$

cannot appear in another relation of the database

$2)$

may or may not appear in another relation of the database

$3)$

must appear in another relation of the database

$4)$

must have unique values in the relation in which it is a foreign key

$5)$

must be part of the primary key in the relation in which it is a foreign key