Right of First Refusal and pen names

Hey all,

I'm considering submitting the first in a multi-part series to Boldstroke Books. In their FAQ section it says they have right of first refusal, and having done research on this I can't find anything relating to pen names. I have 3 pen names which have series either completely or partially published under them. Does this right of first refusal mean that they get first refusal on all books I write under ANY pen name or just the one that's contracted for the series submitted to them?

Thanks.

Right of First Refusal and pen names