"McDonalds" listed as an example under Spelling, Spaces, Hyphens - Option 4 confuses me. Sure, it may have been a compound in its original language ("Mc" meaning "Son/Son of" IIRC) but I wouldn't consider it one in modern English. Definitely sticks out to me among the other reasonable examples. Of the options listed, I'd categorize it as timeless given that it's based on the founders' last name.