Determine whether BC is defined. If it is defined, express the result as a single matrix; if it is not, say "not defined." 2 1 05-6 4 1 A = B = C = 4 2 1 5 -3 2 -4 -3 5 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The expression BC is defined. BC = O B. The expression BC is not defined.

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