The ______________ of a relationship is 0 if there is no explicit need for the relationship to occur or the relationship is optional ?

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The ______________ of a relationship is 0 if there is no explicit need for the relationship to occur or the relationship is optional ?

A. modality
B. cardinality
C. entity
D. structured analysis

Explanation: The modality is 1 if an occurrence of the relationship is mandatory, else 0 for optional relationship