Give an example of how cardinality relates to business policy
Cardinality reflects normal business rules as well as organizational policy. For instance, the 1:1 cardinality between the entities "Salesperson" and "Company Car" suggests that each salesperson in the organization is assigned one company car. If instead the organization's policy were to assign a single automobile to one or more salespersons who share it, this policy would be reflected by a 1:M relationship.
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