A relationship between the instances of two entities is known as:

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Question: A relationship between the instances of two entities is known as:

Option 1: A binary relationship. This is the standard term in data modeling and database design for a relationship that associates two distinct entity instances. The phrase 'two entities' directly implies a relationship between two entity types, which fits the definition of a binary relationship.

Option 2: A beta relationship. There is no formal concept known as a beta relationship in data modeling or database terminology; this option describes a non-existent or incorrect term.

Option 3: A unary relationship. A unary relationship would involve a relationship between instances of the same entity type (a single entity participating more than once in the relationship, such as an employee managing another employee). Since the question specifies two distinct entities, unary is not appropriate here.

Option 4: A composite relationship. In data modeling, a composite relationship is not a standard term for describing the relationship between two entities. It might be confused with composite keys or composite entities, but it does not denote the basic two-entity relationship concept described in the question.

In summary, option 1 correctly identifies the relationship as a binary relationship, matching the idea of a connection between two different entity instances. The remaining options either describe non-existent terms or misinterpret the nature of the relationship by implying the connection involves more than two entities or uses an unconventional descriptor.

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A relationship between the instances of two entities is known as:

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