What are the requirements for Maillard reaction and caramelization to occur? 1) Maillard reaction requires a free carbonyl and a protein, while caramelization only requires sugars to break down 2) Maillard reaction requires sugars to break down, while caramelization requires a free carbonyl and a protein 3) Both Maillard reaction and caramelization require a free carbonyl and a protein 4) Both Maillard reaction and caramelization only require sugars to break down