Write output

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Write output—

1. A B + A B
2. A B + A B
3. A B + A B
4. A B + B A

Correct Option: D

F1 = (AB)′
F2 = (BA)′
Y = F1F2 = [( AB)′ ( BA)′]′
= [(A + B′) ( B + A)] ′ = AB + BA
Alternative Method:
NAND-NAND circuit can be replaced by AND-OR Hence,

Now, F1 = AB,
F2 = BA
Y=F1 + F2 = AB + BA (this is shortcut method).