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If for a square matrix A, A^2 = A then such a matrix is known as _________

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If for a square matrix A, A^2 = A then such a matrix is known as _________

(a) Idempotent matrix

(b) Orthagonal matrix

(c) Null matrix

(d) None of the mentioned

I got this question in an internship interview.

The above asked question is from Operations on Matrices topic in portion Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

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Right choice is (a) Idempotent matrix

Easy explanation: A sqaure matrix is called an Idempotent matrix, if A^2 = A.

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