In the given scenario of Bertrand competition with product differentiation, what does the demand function q1 = a1p1b1p2 and q2 = a2p2b2p1 represent?
a) Demand curve for firm 1 and firm 2 respectively
b) Supply curve for firm 1 and firm 2 respectively
c) Cost function for firm 1 and firm 2 respectively
d) Market equilibrium conditions for the firms