Wipe drive with Lion or Mavericks?

I have a Macbook Pro that I want to securely wipe. It is currently running Lion. Is there any benefit to downloading Mavericks first and then wiping it or should I just go ahead and wipe it with Lion OS?
Thanks.

1.) Can I wipe it straight from Disk Utility, or do I need the disc or USB with the Lion OS connected in order to secure wipe the drive?
2.) What happens after it is completely wiped? How can I put Mavericks on it?
Thanks.

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