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Which of the following is a key part of conceptual design in an entity relationship model? a . ) This model defines every data type

Which of the following is a key part of conceptual design in an entity relationship model?
a.)
This model defines every data type for every column.
b.)
This model is both hardware and database management software dependent.
c.)
This model provides a bird's eye view of the data environment so that it is easy to understand.
d.)
This model adds all of the attributes for each entity.

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