Which of the following statements is correct ?
Aggregation is a weak type of association between two classes with partial ownership.
Association is any relationship between classes. Two special "whole–part" forms of it are aggregation and composition, which differ in how strongly the whole owns its parts.
Aggregation is the weak form: the whole has parts, but the parts can exist independently and may be shared by other wholes (a Department has Teachers; a teacher still exists if the department is closed). Ownership is therefore only partial, and the lifetimes are independent. UML shows it with a hollow diamond.
Composition is the strong form: the whole fully owns its parts and they are created and destroyed with it (a House and its Rooms). UML shows it with a filled diamond.
Calling aggregation a strong association describes composition, and attaching full ownership to it also describes composition; a weak association with full ownership mixes the two notions.
Aggregation is a weak type of association between two classes with partial ownership. option is correct.
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