During logical design, a multivalued attribute is replaced depending on its semantics. Which of the following transformations is incorrect?

Question

During logical design, a multivalued attribute is replaced depending on its semantics. Which of the following transformations is  incorrect ?

Answer

Adding an identifier attribute to the newly created class

Answer

Promoting the multivalued attribute to a class of objects

Answer

Always replacing the multivalued attribute with a one-to-many association

Answer

Removing the multivalued attribute from the original class

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