单项选择题 You share your computer with two users who belong to the Users group. You need to ensure that all users are informed of new updates. What should you do?（）

单项选择题 You configure parental controls on your computer for your childs user account. Your child logs on with a different account and is able to access inappropriate Web sites. You need to ensure that your child cannot access inapproriate Web sites. What should you do?（）

单项选择题 You share your computer with ohter users. You install a new Microsoft Windows Internet Explorer add-on to view videos on the computer. You discover that this add-on conflicts with existing add-ons that other users frequently require. You need to ensure that you are able to view videos without affecting other users. What should you do?（）