The eigen values of $$A = \begin{bmatrix}2 & 2 & 4 \\2 & -1 & 2 \\4 & 2 & 2 \end{bmatrix}$$ are,

A

2, 7, 2

B

-7, -2, -2

C

-2, -2, 7

D

2, -1, 2