For each of the following statements, indicate whether it is true or false. 2. justification is tequired. (a) Let A be a 4 x 5 matrix. Then the columns of A must be linearly dependent. (1) Let B be a 4x4 matrix. If the ayuation Bī =0 laus infinitely many solations, then the columns ofB span R. (e) Let A and B be two matrices. If the product AB is defined, then the product A"B" is also defined. (a) Let A be a 3 × 3 invertible matrix. Then the reduced echelon form of A must be

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