The EMPLOYEES table has six indexes and DML operations are slow. Which command begins monitoring the EMPLOYEE_IDX_FK index to determine whether it has been used by an execution plan？（）<br>A:ALTER TABLE employees monitor index employee_idx_fk; <br>B:ALTER INDEX employee_idx_fk monitoring on; <br>C:ALTER TABLE employees monitor all indexes; <br>D:ALTER INDEX employee_idx_fk monitoring usage;

The EMPLOYEES table has six indexes and DML operations are slow. Which command begins monitoring the EMPLOYEE_IDX_FK index to determine whether it has been used by an execution plan？（）
A:ALTER TABLE employees monitor index employee_idx_fk;
B:ALTER INDEX employee_idx_fk monitoring on;
C:ALTER TABLE employees monitor all indexes;
D:ALTER INDEX employee_idx_fk monitoring usage;

出自：Oracle认证

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