Given that tables T1 and T2 contain the following rows: Table T1: C1 C2 1 4 1 3 1 2 Table T2: C1 C2 1 1 1 2 1 3 Which of the following queries will return only those rows that exist in both T1 and T2?（）

• A、SELECT * FROM t1 UNION SELECT * FROM t2
• B、SELECT * FROM t1 UNION DISTINCT SELECT * FROM t2
• C、SELECT * FROM t1 INTERSECT SELECT * FROM t2
• D、SELECT * FROM t1 WHERE (c1,c2)= (SELECT c1,c2 FROM t2)