Question: What does a weak entity represent in an ER model? Group of answer choices An entity that has a primary key composed of its own

What does a weak entity represent in an ER model?
Group of answer choices
An entity that has a primary key composed of its own attributes only.
An entity that does not have any relationships with other entities.
An entity that cannot exist without the parent entity and has a primary key derived from the parent entity.
An entity that can exist independently of other entities.

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