Current Electricity (Temperature Coefficient)

Consider two circuits, (A) and (B), each having two resistors. One resistor has a positive temperature coefficient of resistance +alpha, while the other has a negative temperature coefficient -alpha. In circuit (A) the two resistors R0(1-alpha.dT) and R0(1+alpha.dT) are connected in series; in circuit (B) they are connected in parallel. The currents are I_A and I_B, and at the initial temperature each resistance is R0. As the temperature is increased, the correct option describing the variation of current is: