单项选择题

Given table T1 has column I1 containing the following d……

Given table T1 has column I1 containing the following data:
I1
1 2 3 4
If the following sequence of SQL statements is applied within a single unit of work:
UPDATE t1 SET i1 = 3 WHERE i1 = 2; S AVEPOINT s1 ON ROLLBACK RETAIN CURSORS; UPDATE t1 SET i1 = 5 WHERE i1 = 3; SAVEPOINT s2 ON ROLLBACK RETAIN CURSORS;INSERT INTO t1 (i1) VALUES (6); ROLLBACK TO SAVEPOINT s1; UPDATE t1 SET i1 = 2 WHERE i1 = 4; COMMIT;
What is the expected sequence of values returned from?（）
SELECT i1 FROM t1 ORDER BY i1

A. 1, 2, 3, 3
B. 1, 2, 2, 4
C. 1, 2, 3, 3, 6
D. 1, 2, 2, 5, 6

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