Americans for a Better Tomorrow, Tomorrow Was a Political Organization

Americans for a Better Tomorrow, Tomorrow was a political organization created by satirist Stephen Colbert to spend money raised from individuals, corporations, and unions using the rules created from Citizens United v. FEC (2010) . As such, he could not collaborate with any candidate, and in fact had to turn power over the organization over to Jon Stewart when Colbert himself became a candidate for office. What term best describes Americans for a Better Tomorrow, Tomorrow?

A) PAC
B) 527 organization
C) super PAC
D) mega PAC
E) 504(c) 3 organization