Which statement best describes the function of Gatekeeper?

A. To prevent users from downloading viruses and trojan horses

B. To prevent users from connecting to unauthorized file-sharing websites

C. To prevent users from opening untrusted applications

D. To prevent users from downloading untrusted applications

How do you start up an OS X computer in single-user mode?

A. Start up from the Recovery system partition and enter the command reboot -single in Terminal.

B. Hold down Command-S while the computer starts up.

C. Hold down Shift-Option while the computer starts up.

D. Select Single-User Mode in the Startup Disk pane of System Preferences, then restart the computer.

How can you display the contents of a hidden folder on a mounted volume in the Finder?

A. From the View menu, choose "Show hidden items."

B. From the Finder menu, choose Preferences and select "Show hidden items."

C. From the Go menu, choose "Go to Folder," enter the path to the hidden folder, and click Go.

D. Select the volume icon and choose "Show hidden items" from the Action menu.

How can you display the serial number for a Mac you're logged in to?

A. Choose About This Mac from the Apple menu.

B. Open System Preferences, then in the General pane, click the Info disclosure triangle to reveal the serial number.

C. Type "serial number" in Spotlight, then scroll through the resulting information until the serial number is displayed.

D. Choose About This Mac from the Apple menu, then click the line of text under OS X until the serial number is displayed.

Which folder contains instructions for the launchd process to start certain items when a user logs in to an OS X computer?

A. /etc/launchd/

B. /var/run/launchd/

C. /Library/Extensions/

D. /Library/LaunchAgents/