Best response to the King's Indian Defense: Normal Variation (E70)

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 · White to move

What is the best response to the King's Indian Defense: Normal Variation (1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6)? White to move. See the top replies ranked by opening theory and real-game results, starting with f3.

The main theoretical reply is f3, reaching the King's Indian Defense: Sämisch Variation.