Question: Which of the following best describes a \'weak entity\' in an ER model?

Options:

1. An entity that cannot exist without a strong entity
2. An entity with no attributes
3. An entity that has a composite key
4. An entity that is not related to any other entity

Correct Answer: An entity that cannot exist without a strong entity

Solution:

A weak entity is an entity that cannot exist without a strong entity and relies on it for its identification.