A lower-triangular sparse matrix is one :

1. Ain which all the non-zero elements lie only on the leading diagonal.
2. Bin which all the non-zero elements lie above leading diagonal.
3. Cin which all the non-zero elements lie below leading diagonal.
4. Dwhich is not defined for sparse matrix.

Pick an option to check yourself, or open the answer below.

Show answer & explanation

Correct answer: C. in which all the non-zero elements lie below leading diagonal.

Explanation

In a lower-triangular matrix all non-zero elements lie on or below the leading diagonal; everything above it is zero.