The set of all values of $\lambda$ for which the system of linear of linear equations : $2x_1-2x_2+x_3 =\lambda x_1 \\ 2x_1-3x_2+2x_3 =\lambda x_2 \\ -x_1 + 2x_2 = \lambda x_3$ has a non- trivital solution,

Question

$\begin{array}{1 1} \text{contains more than two elements} \\ \text{is am empty set } \\ \text{is a singleton } \\ \text{contain two elements } \end{array} $