1. Select correct truth table for operator NOT (NOT x = y).
2. Select correct truth table for operator AND (x AND y = z).
3. Select correct truth table for operator OR (x OR y = z).
4. Select correct truth table for operator NAND (x NAND y = z).
5. Select correct truth table for operator NOR (x NOR y = z).
6. Select correct truth table for operator XOR (x XOR y = z).