Given the data in the accompanying table, what is the rate law for the reaction? initial a: 0.20, 0.20, 0.40 initial b: 0.10, 0.20, 0.20 initial rate: 20, 40, 160

rate= k[a] [b]
rate = k [a] [b]2
rate = k [a]2 [b]
rate = k [a]2 [b]2