Which of the following statements is TRUE?
2017
Which of the following statements is TRUE?
- A.
The cardinality ratio for a binary relationship specifies the maximum number of relationship instances that an entity can participate in.
- B.
The cardinality ratio for a binary relationship specifies the minimum number of relationship instances that an entity can participate in..
- C.
The partial participation constraint is also called existence dependency
- D.
The cardinality ratio for a binary relationship specifies the average number of relationship instances that an entity can participate in.
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Correct answer: A
The correct option is A. The cardinality ratio for a binary relationship defines the maximum number of relationship instances that an entity can participate in (e.g., 1:1, 1:N, M:N). Conversely, participation constraints (total vs. partial) specify the minimum structural boundaries.