A and C, without any information on how the plane is registered it's impossible to answer what is allowed and what is not.
And I truly wonder if he did any research before buying if you buy a plane and after that start to think about how to operate it.
I met a guy who bought a nice twin without engines, not knowing the price of an IO540... He simply assumed he could afford it and he assumed he got a nice deal. Then he was very surprised that the engines were a multiple of what he paid for the plane itself which he obviously couldn't afford. These people exist... And more than I'd like to know.