What is the dimension of the subspace spanned by the following vectors?

[1

2

3

0]

[2

3

0

4]

[5

0

6

7]

[8

5

9

11]

im assuming you can combine these vectors into a matrix which would look like this...

[1 2 5 8

2 3 0 5

3 0 6 9

0 4 7 11]

and then from there what do i do? i think i need to put it in row reduced echelon form, but once i do that, how do i present the answer?