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