Which process can you use to start up a Mac in target disk mode?
Start up from the OS X Recovery partition, choose Target Disk Mode from the Startup Disk menu, then restart the Mac.
Hold down the S key as the Mac starts up, then enter the command shutdown -r -target.
Restart your Mac, then hold down the T key as the Mac starts up.
Hold down the Option key as the Mac starts up, until a dialog appears, then select Target Disk Mode from the dialog.
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