The role of cardinality in an ERD is to define the specific attributes of each entity.

Question

BlackTom AI · Accepted Answer

In evaluating this statement, we need to recall what cardinality in an ERD actually represents.
Option A: True. The claim that cardinality defines the specific attributes of each entity is incorrect. Attributes are properties or characteristics of an entity (like name, id, or date of birth) and are specified in the entity's attribute set, not by the cardinality of relationships. Cardinality concerns how many instances of one entity relate to instances of another entity (for example, one-to-one, one-to-many, many-to-many) rather than what attributes an entity possesses.
Option B: False. This statement accurately identifies the role of cardinality: it defines the quantitative relationship between entities in a model. It specifies how many instances of one entity can be associated with how many instances of another, such as a student having many courses (1:N) or a course having many students (M:N). It does not specify or constrain the attributes that belong to each entity. Attributes and keys are defined independently of the cardinality constraints and are used to describe the entity itself, not its relationships.
Overall, the analysis shows that the assertion in option A conflates relationships with attribute definition, while option B correctly separates relationship cardinality from entity attributes.

COMM_V 335 101 102 2025W1 FINAL EXAM - 2025W1 - Requires Respondus LockDown Browser

The role of cardinality in an ERD is to define the specific attributes of each entity.

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