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A linear time-invariant system is described by the state variable model
$\left[\begin{array}{l} x_{1} \\ x_{2} \end{array}\right]=\left[\begin{array}{rc} -1 & 0 \\ 0 & -2 \end{array}\right]\left[\begin{array}{l} x_{1} \\ x_{2} \end{array}\right]+\left[\begin{array}{l} 0 \\ 1 \end{array}\right] u=\left[\begin{array}{ll} 1 & 2 \end{array}\right]\left[\begin{array}{l} x_{1} \\ x_{2} \end{array}\right]$

1. The system is completely controllable
2. The system is not completely controllable
3. The system is completely observable
4. The system is not completely observable.