I'm a little confused about this question:

http://img84.imageshack.us/img84/6578/1220l.png

Here is what I have thought through so far:

There are two 2x2 matrices of the same type that are in reduced row echelon form. The first is the zero matrix.

0 0

0 0

The second is the matrix of the form:

1 0

0 1

Is this correct, or am I misunderstanding the question?

Thanks for your help.