Go back to 9L0-415 - OS X Support Essentials 10.9

Question :-

How do you start up an OS X Mountain Lion computer in Safe Mode?
Hold down Shift during startup.
Open Terminal, type safe_boot, press Return, and then restart the Mac.
Hold down Command-Option-P-R during startup.
Start up from the OS X Recovery partition, and then choose Safe Boot from the Startup Disk menu.

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