I'm selling a MacBook Pro and want to reformat the hard drive

Hi
I'm selling my MacBook Pro late 2011 model and want to reformat the hard drive so that the new owner ca'nt recover any of my information.
Whats the best way to do this and to ensure that they won't ever be able to recover my personal data ?
Thanks in advance !
Andrew

First of all, see > http://support.apple.com/kb/HT5189?viewlocale=en_US&locale=en_US
In step 4, follow all the steps for OS X Mavericks but, after going to the Erase tab, select "Security Options" and choose one of the secure erase options. Note that a more secure option will take more time. Finally, reinstall OS X and turn off your MacBook Pro.

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