7. Let A and B two 3-by-3 matrices, with |B| = 1. Let C be the inverse matrix of B. Which of the following statements is true? Mark only one oval. 0001 If |A|+ 12B| = 8, then the matrix A is nonsingular. A^2 and A have the same rank only if A is an idempotent matrix. If A is idempotent, the matrix I - BAC is also idempotent. The matrix BAC is idempotent. The matrix BAC is invertible.

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