Pre-Sales Question - Dell XPS Laptops Dedicated Graphics

Hello,

I'm looking at buying one of the Dell XPS Laptops with Dedicated Nvidia Graphics.

Can I ask if the Intel Graphics are automatically disabled in Hardware or does this use the Optimus Technology via the Nvidia Control Panel to choose which Graphics card to use?

I asked the Pre-Sales chat and was told the intel graphics were disabled, but I looked at the user manual and it says Optimus is used.

Could you confirm which is the case?

Thanks

http://www.dell.com/uk/p/xps-15-9560-laptop/pd?oc=cnx95606&model_id=xps-15-9560-laptop