Best response to the Alekhine Defense: Hunt Variation, Lasker Simul Gambit (B02)

1. e4 Nf6 2. e5 Nd5 3. c4 Nb6 4. c5 Nd5 5. Bc4 e6 6. Nc3 · Black to move

What is the best response to the Alekhine Defense: Hunt Variation, Lasker Simul Gambit (1. e4 Nf6 2. e5 Nd5 3. c4 Nb6 4. c5 Nd5 5. Bc4 e6 6. Nc3)? Black to move. See the top replies ranked by opening theory and real-game results, starting with d6.

The main theoretical reply is d6, reaching the Alekhine Defense: Two Pawns Attack, Mikenas Variation.