Given the basic ER and relational models, which of the following is INCORRECT?

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answerhappygod
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Given the basic ER and relational models, which of the following is INCORRECT?

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a) An attribute of an entity can have more than one value
b) An attribute of an entity can be composite
c) In a row of a relational table, an attribute can have more than one value
d) In a row of a relational table, an attribute can have exactly one value or a NULL value
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