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$8$. A probability model is simply a list of outcomes and the probability of each outcome. Which of the following probability models is a legitimate probability model?$\newline$\begin{tabular}{|c|c|c|c|c|c|c|c|c|c|}$\newline$\hline \multicolumn{$10$}{|l|}{\begin{tabular}{l} $\newline$a \\$\newline$Outcome$\newline$\end{tabular}} \\$\newline$\hline \begin{tabular}{|l} $\newline$Outcome \\$\newline$\end{tabular} & $1$ & $2$ & $3$ & $4$ & Outcome & $1$ & $2$ & $3$ & $4$ \\$\newline$\hline Probability & $0$.$3$ & $0$.$25$ & $0$.$25$ & $0$.$25$ & \begin{tabular}{|l} $\newline$Probability \\$\newline$\end{tabular} & $0$.$2$ & $0$.$3$ & $0$.$6$ & $-0$.$1$ \\$\newline$\hline \multicolumn{$5$}{|l|}{$\mathrm{b}$} & \multicolumn{$5$}{|l|}{ d } \\$\newline$\hline Outcome & $1$ & $2$ & $3$ & $4$ & Outcome & $1$ & $2$ & $3$ & $4$ \\$\newline$\hline Probability & $0$.$01$ & $0$.$02$ & $0$.$03$ & $0$.$04$ & Probability & $0$.$2$ & $0$.$25$ & $0$.$35$ & $0$.$2$ \\$\newline$\hline$\newline$\end{tabular}