单选题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？（）AALTER TABLE employees monitor index employee_idx_fk; BALTER INDEX employee_idx_fk monitoring on; CALTER TABLE employees monitor all indexes; DALTER INDEX employee_idx_fk monitoring usage;
单选题
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;
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