（单选题）
Examine the following commands and their output: SQL> SELECT ename, sal FROM emp WHERE ename='JAMES'; ENAME SAL JAMES 1050 QL> UPDATE emp SET sal=sal+sal*1.2 WHERE ename='JAMES'; 1 row updated. SQL> SELECT ename, sal FROM emp WHERE ename='JAMES'; ENAME SAL JAMES 2310 View the exhibit and examine the Flashback Version Query that was executed after the preceding commands. What could be the possible cause for the query not displaying any row?（） 
AFlashback logging is not enabled for the database.
BThe changes made to the table are not committed.
CSupplemental logging is not enabled for the database.
DThe database is not configured in ARCHIVELOG mode.
正确答案
答案解析
略
