Chess Puzzle - Series 3073

White to move. How should white proceed ?

Source : chessdailynews.com

GM_Knockout said ;

1. Kc2!! Kd5
2. Kd3! Kc5
3. e4 fxe4+
4. Kxe4 Kd6
5. Kf5 Ke7
6. Kg6 Kf8
7. Kf6 Ke8
8. Kg7 Ke7
9. f5

OR

1. Kc2!! Kd5
2. Kd3! Kc5
3. e4 fxe4+
4. Kxe4 Kd6
5. Kf5 Ke7
6. Kg6 Kf8
7. Kf6 Kg8
8. Ke7 Kg7
9. f5

OR

1. Kc2!! Kd5
2. Kd3! Ke6
3. Kc4 Kd6
4. Kd4 Ke6
5. Kc5 Ke7
6. Kd5 Kf6
7. Kd6 Kg6
8. Ke5 Kf7
9. Kxf5

- Black resigned 1-0