Two light bulbs,B1 and B2,are connected to a battery having appreciable internal resistance as shown in the figure.What happens to the brightness of bulb B1 when we close the switch S? 
A) The brightness of B1 increases permanently.
B) The brightness of B1 decreases permanently.
C) The brightness of B1 does not change.
D) The brightness of B1 increases temporarily but gradually decreases back to its original brightness.
E) The brightness of B1 decreases temporarily but gradually increases back to its original brightness.
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