Question: Union operation requires (RA) : (Select multiple answers when applicable and explain fully your answer.) A. Two relations to be related via foreign and primary

Union operation requires (RA): (Select multiple answers when applicable and explain fully your answer.)

A. Two relations to be related via foreign and primary key

B. Two relations to have the same number of rows

C. Two relations to have the same number of columns

D. Corresponding attributes must have the same basic data type

E. Corresponding attributes must have the same data type

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