drivers - Nvidia Graphic installed?

I have an Optimus graphic card and had the blank screen issue after installing Nvidia drivers.

I think I installed Bumblebee drivers correctly and everything is running correctly. But, in the Graphics category of System Details, it says graphic driver Unknown.

Questions:

1. Was bumblebee installed correctly and do I now have power management working in my laptop?




2. Is Nvidia now the primary graphic card (the laptop also has Intel mobility)?




3. And if not, if I want to run apps with it, I just have to write optirun in the terminal?