Given, A = 2 [1 2 3 L3 1 O NONE OF THE CHOICES OB x A will have a size of 3 x 3. OBXA will have a size of 4 x 3. O Ax B will have a size of 3 x 4. O Ax B will have a size of 3 x 3. 3] 1 2] f there exists a matrix B whose size is 4 x 3, which of the following must be true?

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