Matrix multiplication

We have matrices $A$, $B$, $C$ and $D$. $$A = \begin{pmatrix} 1 & 2 & 3 \end{pmatrix}, B= \begin{pmatrix} 1 \\ 2 \\3 \end{pmatrix}, C= \begin{pmatrix} 1 & 2 \\ 2 & 3 \end{pmatrix}, D= \begin{pmatrix} 1 & 2 & 3 \\ 1 & 2 & 3 \end{pmatrix}$$And we have $X$, the product of two of these matrices:

$$X= \begin{pmatrix} 1 & 2 & 3 \\ 2 & 4 & 6 \\ 3 & 6 & 9 \end{pmatrix}$$

Find these two matrices!

Write down two letters in the correct order separated by one space. For example, your output may look like this:

C D
or
c d