Three pieces of aluminium rod of different lengths, $44\text{cm}$, $22\text{cm}$ and $55\text{cm}$ respectively, are given to a boy. He has to cut them into rods of same length such that no aluminium waste is left. The maximum length (in cm) of such rod will be:

1. A
   $16.5\text{cm}$
2. B
   $22\text{cm}$
3. C
   $5.5\text{cm}$
4. D
   $11\text{cm}$