A data model is a logical representation of data stored in a database.
What is data model?
A data model is an abstract model that organises and standardises data items' relationships to one another and to the qualities of real-world entities. A data model may require, for example, that the data element representing a car be composed of a number of additional items, each of which represents the colour and size of the automobile and defines its owner. The word "data model" can apply to two distinct but related ideas.
A logical model includes entity and attribute representations, relationships, unique identifiers, subtypes and supertypes, and restrictions between relationships. A logical model may also include domain model objects or relate to one or more domain or glossary models.
So, A is the right answer.
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