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The Entity-Relationship (E-R) model is 1) a diagramming technique that describes record structures (i.e. the fields that make up the records of a file) an alternative to indexing and hashing as a means for providing direct access in files 2) a diagramming technique that describes entities, their attributes, and the relationships between them 3) an alternative to file design in which attributes are used instead of fields 4) a diagramming technique that relates entities to each other, attributes to each other, and relationships to each other Question 38 (2 points) ] A many-to-many unary relationship allows an occurrence of one entity type to be associated with 1) a single occurrence of the same entity type 2) multiple occurrences of the same entity type 3) a single occurrence of another entity type 4) multiple occurrences of another entity type 5) multiple occurrences of three entity types Question 39 (2 points) In a university, the relationship between courses and their sections can best be described as a relationship. 1) one-to-one binary 2) one-to-many binary 3) many-to-many binary 4) one-to-one unary