Given the following two tables: TAB1 R1 A A A B B C C D E TAB2 R2 A A B B C C D Which of the following queries returns the following result set? RETVAL E（）

• A、SELECT r1 AS retval FROM tab1 INTERSECT SELECT r2 AS retval FROM tab2
• B、SELECT r1 AS retval FROM tab1 EXCEPT SELECT r2 AS retval FROM tab2
• C、SELECT DISTINCT r1 AS retval FROM tab1, tab2 WHERE r1 <> r2
• D、SELECT r1 AS retval FROM tab1 UNION SELECT r2 AS retval FROM tab2