In which one of the following the multiple lower entities are grouped or combined together to form a...........

Computer GK DBMS

In which one of the following, the multiple lower entities are grouped (or combined) together to form a single higher-level entity?

Specialization

Generalization

Aggregation

None of the above

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Explanation:

Answer: B
The bottom-up approach is used in the generalization. The several lower-level sub-entities are grouped together to make an individual higher-level entity. In short, we can say that it is totally the opposite of specialization. To understand it more clearly, consider the following example:
Example
Suppose you have several lower entities like bus, car, motorbike etc. So, in order to make a more generalize (or higher level ) entity, you can combine them under a new higher-level entity such as a vehicle.