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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.

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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

I had been asked this question in a job interview.

My query is from Analysis Modelling in division Design and Implementation of Software Engineering

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Best answer
Right answer is (a) modality

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

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