​Is There Any Benefit to the Mill Scale That Can

​Is there any benefit to the mill scale that can be found on almost all hot rolled steel?

A) ​It can help the deoxidizers in the filler metal to react with the weld to make a better weld.
B) ​It can help to prevent rust from forming.
C) ​It acts like a dam along the sides of the weld pool to keep the weld bead from getting too wide.
D) ​No it has no benefit.