If the system of equations \[ \left.\begin{array}{l} x-\lambda y-z=0 \\ \lambda x-y-z=0 \\ x+y-z....

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If the system of equations
\( \mathrm{P} \)
\[
\left.\begin{array}{l}
x-\lambda y-z=0 \\
\lambda x-y-z=0 \\
x+y-z=0
\end{array}\right\}
\]
W
has a unique solution, then the range of \( \lambda \) is \( \mathrm{R}-\{\mathrm{a}, \mathrm{b}\} \). Then the value of \( \left(\mathrm{a}^{2}+\mathrm{b}^{2}\right) \) is:
(A) 1
(B) 2
(C) 4
(D) 9


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