A matrix A=[a(ij)] is an upper triangula...

A matrix `A=[a_(ij)] is an upper triangular matrix if (A) it is a square matrix with `a_(ij)=0 for igtj` (B) it is a square with`a_(ij)=0 for iltj` (C) it is not a square matrix with `a_(ij)=0 for igtj` (D) if is not a sqare matrix with`a_(ij)=0 for iltj`

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