If the rank of a (5 6) matrix Q is 4...

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If the rank of a (5 × 6) matrix Q is 4, then which one of the following statements is correct?

A. Q will have four linearly independent rows and four linearly independent columns

B. Q will have four linearly independent rows and five linearly independent columns

C. QQ^T will be invertible

D. Q^TQ will be invertible

Answer: Option A

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