QTR-Quadtone RIP

I am using i1match for B&W soft proofing  for photoshop and following Roy's Delineated 
procedure. I have one problem. When I open up Target 51 the Embedded Profile Mismatch 
Dialogue Box Asks me how I want to proceed?
   a) Use embedded profile
   b) Convert to working space (My working space is Adobe RGB 1998)
   c) Discard embedded profile (don't color manage}
Which is the appropriate choice?
Thanks for your help.

Howard