True or false. Please provide the reason if the statement is false. Let Q be a mxn matrix with orthonormal columns where m≥n. (a) QTQ = I. (b) QQ¹ = I. (c) The projection matrix onto the column space of Q is QTQ. (d) The least square solution of Qx = b is Q¹b. (e) For two square orthogonal matrices Q₁ 1 and Q2, Q₁ Q2 is also an orthogonal matrix.

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A: NOTE: Refresh your page if you can't see any equations. . apply radical rule

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A: Let's find.