Daniel is a history professor who writes books about Byzantine Empire. He is well known in the field for his books, and his students often approach him with copies to get his signature. Although Daniel enjoys writing books much more than teaching, his writing does not make up :
large part of his income, so it would not be lucrative for him to do it full-time. Daniel is MOST likely what kind of writer?

A. freelance writer

B. article writer

C. academic writer

D.business writer