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