Chess Puzzle - Series 3017

White to move. How should white proceed ?

Caruana, Fabiano VS Grischuk, Alexander ( Paris )

Source : chessdailynews.com

GM_Knockout said ;

1. Nf3+!! gxf3
2. Qh4! fxg4
3. Qxg4+ Kh1
4. Kg8

OR

1. Nf3+!! gxf3
2. Qh4! Ndf4
3. g3 

- Black resigned 1-0