为自己加油

Oracle Data Redaction is active on the SCOTT.EMP table.
You queried the table twice.
SQL> SELECT ENAME SAL COMM MGR HIREDATE FROM EMP WHERE DEPTNO=30;

SQL> SELECT ENAME SAL COMM MGR HIREDATE FROM EMP WHERE DEPTNO=30;

Which is guaranteed to be true concerning the redaction policy?

A.FULL redaction is active on the SAL column
B.RANDOM redaction is active on the MGR column
C.RANDOM redaction is active on the HIREDATE column
D.PARTIAL redaction is active on the MGR column.
E.PARTIAL redaction is active of the HIREDATE column.