If a 7 by 9 matrix has rank 5, what are the dimensions of its four subspaces

a) Row space: 5, Null space: 2, Column space: 5, Left null space: 4
b) Row space: 7, Null space: 4, Column space: 5, Left null space: 2
c) Row space: 5, Null space: 4, Column space: 7, Left null space: 2
d) Row space: 4, Null space: 5, Column space: 7, Left null space: 2