Best response to the English Opening: Anglo-Indian Defense, Queen's Knight Variation (A16)

1. c4 Nf6 2. Nc3 · Black to move

What is the best response to the English Opening: Anglo-Indian Defense, Queen's Knight Variation (1. c4 Nf6 2. Nc3)? Black to move. See the top replies ranked by opening theory and real-game results, starting with d5.

The main theoretical reply is d5, reaching the English Opening: Anglo-Grünfeld Defense.