Hello, I am considering to buy a used Macbook Pro 15" mid 2014 model. I stumbled upon a listing which says "MID-2014 APPLE MACBOOK PRO 15 RETINA CORE i7 2.8GHz / 16GB DDR3L 1600MHz / 256GB SSD / Intel Iris Pro 5200 + nVidia GeForce GT 750M Dual Graphic / MacOS 10.12 Sierra, Model CTO/BTO" Does such a configuration exist? Does the dual graphic card option allow 256gb SSD? I sent the seller a message but haven't received an answer yet.. Thanks for your time.