Suppose that $A$ is a $3 \times 8$ matrix that has an echelon form with no zero rows. Find the dimension of the row space of $A$, the dimension of the column space of $A$, and the dimension of the null space of $A$.

The dimension of the row space of $A$ is .
The dimension of the column space of $A$ is .
The dimension of the null space of $A$ is .