Matrix is of order and matrix is of order

MATHEMATICS · Single correct · AP · AP Precalculus · Functions with Parameters, Vectors, and Matrices · Functions with Parameters, Vectors, and Matrices

Problem

Matrix XX is of order 6×46 \times 4 and matrix YY is of order 4×54 \times 5. By deleting the minimum possible number of rows and/or columns from each matrix, identical submatrices are obtained that can be added together. What is the order of the largest such submatrices? (a) 6×46 \times 4 (b) 4×44 \times 4 (c) 4×54 \times 5 (d) 6×56 \times 5

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