\textbf{163.} A scale is fixed to the floor of an elevator. During motion, the scale shows a person's weight greater than the rest value. How is the elevator moving?
\begin{itemize}
\item[(1)] Necessarily accelerating upward
\item[(2)] Necessarily accelerating downward
\item[(3)] Accelerating upward or decelerating downward
\item[(4)] Decelerating upward or accelerating downward
\end{itemize}
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