Which relationship is depicted in the following entity-relationship (ER) diagram?

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The correct interpretation that an entity-relationship (ER) diagram is depicting a one-to-many relationship can be understood through the characteristics of the entities involved. In a one-to-many relationship, a single instance of one entity is associated with multiple instances of another entity.

For instance, consider a scenario such as a "Customer" entity and an "Order" entity. A single customer can place many orders, establishing a direct one-to-many relationship between these two entities. In the ER diagram, you would typically see a line representing the connection from the "Customer" to multiple "Orders," showing that one customer can relate to many orders.

In contrast, a one-to-one relationship would imply that for each instance of one entity, there is a corresponding instance of another entity, which would not be represented with the same multiplicity. A many-to-many relationship indicates that multiple instances of one entity can relate to multiple instances of another, which would show a different connection style in the diagram. A ternary relationship involves three entities interacting, which would also look distinct.

Thus, if the ER diagram shows that one entity has multiple associated instances of another entity, it definitively illustrates a one-to-many relationship, affirming the choice made.

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