A linear system is described by the state equations

\[
\begin{aligned}
{\left[\begin{array}{l}
\dot{x}_{1} \\
\dot{x}_{2}
\end{array}ight] } & =\left[\begin{array}{ll}
1 & 0 \\
1 & 1
\end{array}ight]\left[\begin{array}{l}
x_{1} \\
x_{2}
\end{array}ight]+\left[\begin{array}{l}
0 \\
1
\end{array}ight] r \\
y & =x_{2}
\end{aligned}
\]
(a) \(\frac{1}{(s+1)}\)
(b) \(\frac{1}{(s+1)^{2}}\)
(c) \(\frac{1}{(s-1)}\)
(d) \(\frac{1}{(s-1)^{2}}\)