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99. In a 555 timer, three 5 k resistors provide a trigger level of ________.
(a) 1/4 VCC and a threshold level 1/2 VCC
(b) 1/3 VCC and a threshold level 3/4 VCC
(c) 1/3 VCC and a threshold level 2/3 VCC
(d) 1/4 VCC and a threshold level 2/3 VCC
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