[Solved] The __________ of a relationship is 0 if there is no explicit need for the relationship to occur or the relationship is optional.

Q.	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
Answer» A. modality
Explanation: the modality is 1 if an occurrence of the relationship is mandatory, else 0 for optional relationship.

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