Given Aiis the ith attribute, Di is the ith domain name, which one of the following expressions is a relation schema? ( ) Re (A1:D1, A2:D2, A3:D3,…, An:Dn) ( ) (A1:D1, A2:D2, A3:D3,…, An:Dn) ( ) Re (A1, A2, …, Ai,…, An) ( ) Re (D1: A1 , D2: A2, …, Di: Ai,…, Dn: An)

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