How to erase refurb Pro before returning if no install disk?

Sadly, my 13-inch early 2011 Macbook Pro refurb has had freezes since it arrived two days ago, and it's often slower to load web pages than my early 2008 Macbook -- so back to Apple it will go.  The unit came with Lion installed and no disks, but I'll need to erase my data before I return it; I'd only feel comfortable by using a secure erase method (writing zeros) via Disk Utility, but will the resulting "empty" computer be acceptable to Apple?  (Yes, I know I can call Apple to ask when they open in the morning, but am just getting antsy for an answer.)  Thank you!

Hold Command and r keys down and reboot into the Lion Recovery Partition.
From there you can use Disk Utility to Zero the Lion OS X Partition.
Don't bother waiting hours for Lion to download if the machine is going back to them, let them bother installing Lion.
https://discussions.apple.com/message/16276201#16276201

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