(1) Educational organization. An educational organization is described in section 170(b)(1)(A)(ii) if its primary function is the presentation of formal instruction and it normally maintains a regular faculty and curriculum and normally has a regularly enrolled body of pupils or students in attendance at the place where its educational activities are regularly carried on. The term includes institutions such as primary, secondary, preparatory, or high schools, and colleges and universities. It includes Federal, State, and other public-supported schools which otherwise come within the definition. It does not include organizations engaged in both educational and noneducational activities unless the latter are merely incidental to the educational activities. A recognized university which incidentally operates a museum or sponsors concerts is an educational organization within the meaning of section 170(b)(1)(A)(ii). However, the operation of a school by a museum does not necessarily qualify the museum as an educational organization within the meaning of this subparagraph.