Which of the following is true? Select all possible answers. The sum of two eigenvectors is always an eigenvector The scalar multiple of an eigenvector is always an eigenvector DIf L is an eigenvector and N is a vector in the null space of a matrix A, then L + N will be an eigenvector DA 3 x 3 matrix always has at least one real eigenvalue DAll rotation matrices in 2D have real eigenvalues

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