The term “nonprofit educational organization” means an educational organization described in section
170
(b)(1)(A)(ii) which is exempt from income tax under section
501
(a). The term also includes a school operated as an activity of an organization described in section
501
(c)(3) which is exempt from income tax under section
501
(a), if such school 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.