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

GATE · 2012 · CS · Computer Science & IT

1. A.

   An attribute of an entity can have more than one value

2. B.

   An attribute of an entity can be composite

3. C.

   In a row of a relational table, an attribute can have more than one value

4. D.

   In a row of a relational table, an attribute can have exactly one value or a NULL value

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