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Truth table for system of four NAND gates as shown in figure is
(a)
\begin{tabular}{|c|c|c|}
\hline \( \mathrm{A} \) & \( \mathrm{B} \) & \( \mathrm{Y} \) \\
\hline 0 & 0 & 0 \\
\hline 0 & 1 & 1 \\
\hline 1 & 0 & 1 \\
\hline 1 & 1 & 0 \\
\hline
\end{tabular}
(b)
\begin{tabular}{|c|c|c|}
\hline \( \mathrm{A} \) & \( \mathrm{B} \) & \( \mathrm{Y} \) \\
\hline 0 & 0 & 0 \\
\hline 0 & 1 & 0 \\
\hline 1 & 0 & 1 \\
\hline 1 & 1 & 1 \\
\hline
\end{tabular}
(c)
\begin{tabular}{|c|c|c|}
\hline \( \mathrm{A} \) & \( \mathrm{B} \) & \( \mathrm{Y} \) \\
\hline 0 & 0 & 1 \\
\hline 0 & 1 & 1 \\
\hline 1 & 0 & 0 \\
\hline 1 & 1 & 0 \\
\hline
\end{tabular}
\begin{tabular}{|c|c|c|}
\hline \( \mathrm{A} \) & \( \mathrm{B} \) & \( \mathrm{Y} \) \\
\hline 0 & 0 & 1 \\
\hline 0 & 1 & 0 \\
\hline 1 & 0 & 1 \\
\hline 1 & 1 & 1 \\
\hline
\end{tabular}
(d)
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