Which process will let you start up a Mac in target disk mode?

A. Hold down the S key on the keyboard while the Mac starts up, then enter the command reboot -target.

B. Open the Startup Disk preferences, click Target Disk Mode, and then click Restart.

C. Start up from the OS X Recovery partition, choose Target Disk Mode from the Startup Disk menu, and restart the Mac.

D. Hold down the Option key on the keyboard as the Mac starts up, until a dialog appears, then select Target Disk Mode from the dialog.

On your OS X Mountain Lion computer, you want the Finder to display filename extensions by default. How can you configure this setting from the Finder?

A. Choose Preferences from the Finder menu, click Advanced, and select the option "Show all filename extensions."

B. Control-click anywhere on the Desktop, select Preferences from the pop-up menu, click Advanced, and select the option "Show all filename extensions."

C. Choose Show View Options from the View menu, and select the option "Show all filename extensions."

D. Select any file icon, and choose Get Info from the File menu. In the Info window, click the disclosure triangle next to Name and Extension, deselect the option "Hide extension," and click Change All.

In OS X, which is a valid method to reset permissions and ACLs on a home folder to their default settings?

A. Start the computer from the OS X Recovery partition, open Terminal from the Utilities menu, enter resetpassword at the prompt, select the system volume and the user account, and click Reset.

B. Open Disk Utility from the Utilities folder on the startup volume, select the volume with the home folder, and click Repair Permissions.

C. Select the user home folder in the Finder, choose Get Info, choose Reset Permissions from the action pop-up menu, and authenticate as the user.

D. Start the computer from the OS X Recovery partition, select Password Reset from the OS X Utilities window, select the system volume and the user account, and click Reset.

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

A. Hold down Shift-Option while the computer restarts.

B. Hold down Command-S while the computer restarts.

C. Start up from the Mountain Lion Recovery system partition, and enter the command reboot -single in Terminal.

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

When a user chooses Shut Down from the Apple menu, what process quits all of the user's open applications and tells the kernel to power down the computer?

A. init

B. launchd

C. loginwindow

D. kernel_task