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When is an association class needed?§ When the multiplicity of the relationship is many-to-many (N:M).§ When the relationship is unidirectional.§ When the relationship has properties.§ When the relationship is mandatory.§ When the relationship is optional.
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- When is an association class needed?A. When the multiplicity of the relationship is many-to-many (N:M).B. When the relationship is unidirectional.C. When the relationship has properties.D. When the relationship is mandatory.E. When the relationship is optional.