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In a database management system (DBMS), what is the "cardinality"?
Correct Answer: A
Explanation/Reference: Explanation: In database design, the cardinality or fundamental principle of one data table with respect to another is a critical aspect. The relationship of one to the other must be precise and exact between each other in order to explain how each table links together. In the relational model, tables can be related as any of "one-to-many" or "many-to-many." This is said to be the cardinality of a given table in relation to another. Incorrect Answers: B: The number of columns in a relation would be the size of the key. It is not the cardinality of the relation. C: Cardinality concerns the relation between two tables, not allowable attributes. D: Cardinality concerns one specific relation between two tables, not the number of relations in a database. References: https://en.wikipedia.org/wiki/Cardinality_(data_modeling)