Question $8$

$1pts$

The principle of 'entity integrity'. $$

$q,$

states that a non$-$null foreign key value in one table must match a primary key value in the related table.

states that every primary key value in one table must have at least one matching foreign key reference in the related table.

states that every primary key value in one table must match exactly one foreign key value in the related table.

states that every primary key value in a table must contain a unique value.