Positive and negative level logic system


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First write the logic table for nand gate:
High High | Low
High Low | High
Low High | High
Low Low | High

Now for positive logic associate high=1 and low =0 (You will get NAND GATE Truth table)
1 1 | 0
1 0 | 1
0 1 | 1
0 0 | 1

For negative logic associate high=0 and low=1 (You will get NOR GATE Truth table)
0 0 |1
0 1 |0
1 0 |0
1 1 |0

So ans is NOR gate.