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37. If all inputs to a TTL NAND gate are low, what is the ON, OFF condition of each transistor in the circuit?
(a) Q1-ON, Q2-OFF, Q3-ON, Q4-OFF
(b) Q1-ON, Q2-ON, Q3-OFF, Q4-OFF
(c) Q1-OFF, Q2-OFF, Q3-ON, Q4-ON
(d) Q1-OFF, Q2-ON, Q3-OFF, Q4-ON
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