Let a1, a2, a3 be linearly independent vectors in R3, and let A = [a1 a2 a3]. Which of the following statements are true?
(a) The reduced row echelon form of A is I3.
(b) The rank of A is 3.
(c) The system [A | b] has a unique solution for any vector b in .
(d) (a), (b), and (c) are all true.
(e) (a) and (b) are both true, but not (c).
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