Q. If a matrix A = [A₁₁ A₁₂⋯A_1n A₂₁ A_2n â‹® â‹® A_n1 A_n2 ⋯ A_nn ], order(nxn) A_ii = 1, A_ij = 0 for i ≠ j. Then that matrix is know as

• Identity matrix
• Null matrix
• Singular matrix
• none of the mentioned

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