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For the given logic gate circuit, which of the following is the correct truth table?

$$Z = \overline{n \cdot (n + m)}$$
$$Z = \overline{n \cdot n + n \cdot m}$$
$$Z = \overline{n + n \cdot m}$$
$$Z = \overline{n(1 + m)}$$
$$Z = \overline{n}$$
Hence, option (D) is correct.
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