61. A circuit is connected as shown. All light bulbs are identical. When the switch in the circuit is closed illuminating bulb \#4, which other bulb(s) also become brighter?
(A) Bulb \#1 only
(B) Bulb \#2 only
(C) Bulbs \#2 and \#3 only
(D) Bulbs \#1, \#2, and \#3