In an echelon form which of the following is incorrect ?

Options

A. Every row of A which has all its entries 0 occurs below every row which has a non-zero entry.
B. The first non-zero entry in each non-zero row is 1
C. The number of zeros before the first non-zero element in a row is less than the number of such zeros in the next row
D. Two row can have same number of zeros before the first non-zero entry

Answer

b