单项选择题 Which of the following is used by BitLocker to lock an encryption key and protect data?（）

单项选择题 After installing a new video card, the computer loads Windows and continuously reboots. Which of the following would be the FIRST step that a technician should take?（）

单项选择题 A user is browsing to a newly created internal site called www.comptia.org. After putting incredentials the page comes up blank. Which of the following is MOST likely the cause?（）