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All the database users are presently connected to the database instance and working. The HR user hasopened three database sessions and executed the following command in one of his sessions：SQL> UPDATE persons SET ccode=’U031’ WHERE ccode=’U029’； 123 rows updated.SQL> DELETE FROM persons WHERE exp=’Y’；3 rows deleted. The SYS user opens a new session after HR executed the above commands.  Which sessions can see theeffect of the UPDATE and DELETE commands（）
A:All sessions of the HR user only
B:All sessions of the HR user and the SYS user
C:The session of the HR user that executed the commands
D:All the sessions for which the database users have access privilege to the PERSONS table

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出自：Oracle认证

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