A square matrix A = [aij ]nxn, if aij = 0 for i > j then that matrix is known as:

A square matrix A = [aij ]nxn, if aij = 0 for i > j then that matrix i

1.	A square matrix A = [aij ]nxn, if aij = 0 for i > j then that matrix is known as:
A.	Upper triangular matrix
B.	Lower triangular matrix
C.	Unit matrix
D.	Null matrix
Answer» B. Lower triangular matrix