The sizes of two matrices A and B are given. Find the sizes of the product AB and the product BA, if the products are defined.A is 2 × 1, B is 1 × 1.
A. AB is 1 × 2, BA is 1 × 1.
B. AB is 2 × 2, BA is 1 × 1.
C. AB is 2 × 1, BA is undefined.
D. AB is undefined, BA is 1× 2.
Answer: C
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