Four identical bulbs are shown in the circuit in Figure Q19.9 with the switch open. How does the brightness of bulbs 1, 3, and 4 change when the switch is closed?
a. 1 gets dimmer 4 gets brighter, and 3 stays the same.
b. 1 stays the same, 4 gets brighter, and 3 gets dimmer.
c. 1 stays the same, 4 gets brighter, and 3 stays the same.
d. 1, 3, and 4 all stay the same.
e. None of these is correct.
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