\text { The matrix }\left[\begin{array}{rrr} 9 & -2 & -4 \\ -2 & 14 & -4 \\ -4 & -4 & 18 \end{array}\right] \text { has eigenvector }\left[\begin{array}{l} 2 \\

1 \\ 1 \end{array}\right] \text { . } Select the option that gives the corresponding eigenvalue. A-12 в 6 С 12 D -6