Using the schematic diagram of a TTL NAND gate, determine the state of each transistor (ON or OFF) when all inputs are high.

• Q1-ON, Q2-OFF, Q3-ON, Q4-OFF
• Q1-ON, Q2-ON, Q3-OFF, Q4-OFF
• Q1-OFF, Q2-OFF, Q3-ON, Q4-ON
• Q1-OFF, Q2-ON, Q3-OFF, Q4-ON