2.

An ID-dependent entity could be best described as

	1.	a special type of weak entity that has a surrogate key
	2.	an entity with a maximum cardinality of one.
	3.	a special type of supertype entity.
	4.	a strong entity in which the identifier of the entity includes the identifier of another entity.
	5.	as a special type of weak entity in which the identifier of the entity includes the identifier of another entity