Which of the following is true for a square matrix A? I. The trace of the matrix is ​​equal to the sum of the eigenvalues ​​of the matrix. II. The constant term of the characteristic polynomial of the matrix is ​​equal to the determinant of the matrix. III. If the matrix is ​​of order 4x4, the leading number of the characteristic polynomial is positive. IV. The product of the eigenvalues ​​of the matrix is ​​equal to the determinant of the matrix.

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