Examine the code：&ens

多项选择题 Examine the code： CREATE ROLE readonly IDENTIFIES USING app.chk_readwrite ； CREATE ROLE readwrite IDENTIFIED USING app.chk_readwrite ； CREATE OR REPLACE PROCEDURE app.chk_readwrite AUTHID CURRENT_USER IS ipchk STRING（30）； BEGIN IF sys_context（‘USERENV’，’ISDBA’）=’TRUE’ THEN DBMS_SESSION.SET_ROLE‘READWRITE’）； ELSE DBMS_SESSION.SET_ROLE（‘READONLY’）； END； / Which three statements correctly describe the Secure Application role definition？（）: A、No user or application has to remember or hide a password.; B、It prevents everyone except a true DBA session from acquiring the READWRITE role.; C、app.chk_readwrite is called whenever a user tries to access rows protected by the READONLY or READWRITE label.; D、app.chk_readwrite is called by users or applications when they want to enable the READONLY or READWRITE role.

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