Finding basis test within a couple of hours!

Hey guys, from what I know there are four different bases. Left Nullspace, nullspace, row space, and column space which each has their own basis. The question asks, for the following system R5, Find a basis of this subset, what is its dimensions.

[ 1 2 1 2 1 ]

[-1 -2 0 0 1]

[-2 -4 0 1 3]

[ 0 0 1 3 3 ]

[ 1 2 2 5 4 ]

Can someone explain what basis they are looking for and how to answer this question? My friend told me its just asking for the row space basis. I dont have much time!

TIA