The eigenvalues of a symmetric matrix are all

(A) complex with non-zero positive imaginary part.

(B) complex with non-zero negative imaginary part.

(C) real.

(D) pure imaginary.

The eigenvalues of a symmetric matrix are all

(A) complex with non-zero positive imaginary part.

(B) complex with non-zero negative imaginary part.

(C) real.

(D) pure imaginary.

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