When \( A^T = A^{-1} \)?

Algebra Level pending

If \(A\) is a square matrix and \( A^T A= I ,\) the Identity matrix.

Which of the following is true?

\(a. \ \)Each column of \( A\) has unit length and is perpendicular to every other column.

\(b. \ A\) is an orthogonal matrix.

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