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(C) square matrix $A = [a_{ij}]$ is called a lower triangular matrix if all elements above the main diagonal are zero,i.e.,$a_{ij} = 0$ for all $i < j

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$A$ lower triangular matrix

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(C) square matrix $A = [a_{ij}]$ is called a lower triangular matrix if all elements above the main diagonal are zero,i.e.,$a_{ij} = 0$ for all $i In the given matrix $A = \begin{bmatrix} 1 & 0 & 0 & 0 \ 2 & 3 & 0 & 0 \ 4 & 5 & 6 & 0 \ 7 & 8 & 9 & 10 \end{bmatrix}$,the elements above the main diagonal are $a_{12}=0, a_{13}=0, a_{14}=0, a_{23}=0, a_{24}=0, a_{34}=0$.Since all elements $a_{ij} = 0$ for $i Therefore,the correct option is $C$.

If $A = \begin{bmatrix} 1 & 0 & 0 & 0 \\ 2 & 3 & 0 & 0 \\ 4 & 5 & 6 & 0 \\ 7 & 8 & 9 & 10 \end{bmatrix}$,then $A$ is

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