In $2010,$ Jon "Neverdie" Jacobs sold his virtual real estate complex in the online game Entropia for a reported $$635,000$in real U$.$S$.$ dollars. The Entropia Universe has its own virtual economy with a fixed exchange rate to the real world. The real estate Jacobs sold, that was allegedly originally purchased with $$100,000$ mortgage from his non$-$cyberspace home, included $20$ large biodomes for hunting and mining; $1,000$ apartments and a circular shopping area with $66$ stores. Are virtual goods like Club Neverdie real property, personal property, intellectual property, or something else?

a$.$ Intellectual property, because it is intangible.

b$.$ Personal property, because it is property other than real estate.

c$.$ Real property, because it is fixed in one location within the online platform.

d$.$ Something else.