Obtain the eigen values of the matrix.\(A = \left[ {\begin{array}{*{20}{c}}1&2&{34}&{49}\\0&2&{43}&{94}\\0&0&{ - 2}&{104}\\0&0&0&{ - 1}\end{array}} \right]\)

• A. 1, -2, -1, 2
• B. 1, 0, 0, 1
• C. 1, 2, 1, 1
• D. 1, 0, -1, 2