What does the term "weak entity" refer to in an ERD?

An entity that depends on another entity for identification
An entity that does not have a unique identifier
An entity with a composite primary key
An entity without any attributes

In an ERD, a weak entity is one that does not have a unique identifier on its own and depends on another related entity for identification. It typically has a partial key, which is a set of attributes that, in combination with the parent entity's key, uniquely identifies instances of the weak entity.

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