Which statement is correct? a. In the relational model, the tuple constructor can only be used on

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Which statement is correct?

a. In the relational model, the tuple constructor can only be used on atomic values and the set constructor can only be used on tuples.

b. In the relational model, the tuple constructor allows defining composite attribute types.

c. In the relational model, the set constructor allows defining multivalued attribute types.

d. In the relational model, the tuple and set constructor can be used in a nested way.

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