If a matrix A = [A11 A12 ⋯ A1n A21 A2n ⋮ ⋮ An1 An2 ⋯ Ann], order(nxn) Aii = 1, Aij = 0 for i ≠ j. Then that matrix is known as ________

If a matrix A = [A11 A12 ⋯ A1n A21 A2n ⋮ ⋮ An1 An2 ⋯ Ann], order(nxn) Aii = 1, Aij = 0 for i ≠ j. Then that matrix is known as ________

(a) Identity matrix

(b) Null matrix

(c) Singular matrix

(d) None of the mentioned

This question was posed to me in semester exam.

This interesting question is from Types of Matrices topic in section Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

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If a matrix A = [A11 A12 ⋯ A1n A21 A2n ⋮ ⋮ An1 An2 ⋯ Ann], order(nxn) Aii = 1, Aij = 0 for i ≠ j. Then that matrix is known as ________

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