Discussion
The approach represented by ER modeling is :
Answer: B
ER modelling represents a top down approach.
An entity-relationship design starts from the whole problem: the designer first identifies the main entities and the relationships between them, then refines them by adding attributes, keys and cardinalities, and finally maps the model to tables. Moving from the general picture to the details is the top-down method.
Normalisation is the usual example of the bottom-up approach, starting from individual attributes and grouping them into relations. 'Left right' and 'bottom left' are not design approaches.
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