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
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.