Eigen values of the matrix left begin array 20 c 3&...

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Eigen values of the matrix \[\left[ {\begin{array}{*{20}{c}} 3&{ - 1}&{ - 1} \\ { - 1}&3&{ - 1} \\ { - 1}&{ - 1}&3 \end{array}} \right]\] are

A. 1, 1, 1

B. 1, 1, 2

C. 1, 4, 4

D. 1, 2, 4

Answer: Option C

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