Universal NAND gate and its application in level monitoring in chemical plant

Problem statement:The supervisor of the manufacturing process prefers to have a RED LED to turn ON when either tank A(input button1) or tank B (input button 2) or both tank levels drop below ¼ full-level.

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What modification would be required in the external circuit (limiting resistor & RED LED) connected to the output of NAND gate?
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If external connections are done according to the solution of Q.1; then we refer to the IC as _____________ current.
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The output of NAND gate is LOW __________
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Which of the following gate can replace the NAND gate?
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The following logic gates equivalent to each other.
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