find a basis for the row space of A

the reduced row-echelon form matrix A = [1 3 2 4] [1 3 0 0]
[2 6 1 2] [0 0 1 2]
[2 6 2 4] is [0 0 0 0]
[2 6 3 6] [0 0 0 0]
please show complete solution.
a.) find a basis for the row space of A.
b.) find a basis for the column space of A.
c.) what is the dimension of the column space of A.
d. find a basis for the solution space of Ax = 0.
e.) what is the dimension of the null space of A?