Consider two circuits, (A) and (B), each having two resistors. One of them has a positive temperature coefficient of resistance, + , while the other one has a negative temperature coefficient, - , as shown in the figure. The current through these circuits are denoted by I A and I B . At initial temperature, the resistance of the two resistors is R 0 . As the temperature is increased, the correct option that describes the variation of current in these circuits is:

1. A. I A remains constant while I B increases
2. B. I A decreases while I B increases
3. C. I A increases while I B decreases
4. D. I A and I B remain constant

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