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[Participation points only] Suppose that A is a 4 × 6 matrix and that dim Nul A = 2. Then Col A = R4 . (a) True (b) False () 1/3 Suppose that A is a 10 × 9 matrix and has 6 pivot columns. Then (a) Col A = R6 . (b) dim Col A = 6 (c) any basis of Col A consists of 6 vectors (d) (a) and (b) (e) (b) and (c) () 2/3 Let rank A = 5. Suppose that columns 1, 3, 4, 5 and 7 of A are linearly independent, but that not all of them are pivot columns. These columns, however, still form a basis for Col A. (a) True (b) False () 3/3