[单选] Which statement about using McAfee and Webroot together is true？（） 

Which of the following dynamic view would you query to identify the online CURRENT redo log group？（） V$LOG。 V$LOFHIST。 V$LOGFILE。 V$LOG_HISTORY。 继电器的返回系数是（）与（）之比。 “我不得不和历史作战”，诗句出自北岛《（）》一诗。 孤独症患儿，若出现退缩、刻板、攻击、自伤行为时，可给予下列哪项治疗（） 安定。 利培酮。 氟哌啶醇。 麦普替林。 β₂受体激动剂。 Click the Exhibit button and examine the data from the EMP table. The COMMISSION column shows the monthly commission earned by the employee. Which two tasks would require subqueries or joins in order to be performed in a single step? （） listing the employees who earn the same amount of commission as employee 3。 finding the total commission earned by the employees in department 10。 finding the number of employees who earn a commission that is higher than the average commission of the company。 listing the departments whose average commission is more than 600。 listing the employees who do not earn commission and who are working for department 20 in descending order of the employee ID。 listing the employees whose annual commission is more than 6000。 Which statement about using McAfee and Webroot together is true？（）