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If $A = [a_{ij}]$ is a scalar matrix of order n x n such that $a_{ij} = k$ for all i=j, then trace of A is

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Correct option is B

trace of A= sum of the principal diagonal elements =k+k+...+k=nk

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If A=aij is a scalar matrix of order n x n such that aij=k for all i=j, then trace of A is

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If $A = [a_{ij}]$ is a scalar matrix of order n x n such that $a_{ij} = k$ for all i=j, then trace of A is