The installation of OS X Yosemite has failed. First Aid in Disk Utility reports directory damage but cannot repair it. What do you do next? A. Reinstall OS X using the Recovery System. B. Replace the hard drive. C. Erase…

John often uses his computer around his roommates. He would like to keep his information private by requiring a password each time the computer wakes from sleep. How does John enable this feature? A. Open System Preferences and click Desktop…