英文翻译18- In order to avoid virus,

In order to avoid virus, employees should _______________. ?榉乐共《荆??T??： a、download a lot of free software available on the Internet ?木W上下載免費?件 b、 frequently use anti-virus software ?常使用?⒍拒?件 c、 turn to IT staffs for help 向IT人?T求助 d、 be alert to virus threats 提防病毒的袭击 我覺得??是B