(A) service performed in any calendar quarter in the employ of any organization exempt from income tax under section 501(a) (other than an organization described in section 401(a)) or under section 521, if the remuneration for such service is less than $50, or

(B) service performed in the employ of a school, college, or university, if such service is performed (i) by a student who is enrolled and is regularly attending classes at such school, college, or university, or (ii) by the spouse of such a student, if such spouse is advised, at the time such spouse commences to perform such service, that (I) the employment of such spouse to perform such service is provided under a program to provide financial assistance to such student by such school, college, or university, and (II) such employment will not be covered by any program of unemployment insurance, or

(C) service performed by an individual who is enrolled at a nonprofit or public educational institution which normally maintains a regular faculty and curriculum and normally has a regularly organized body of students in attendance at the place where its educational activities are carried on as a student in a full-time program, taken for credit at such institution, which combines academic instruction with work experience, if such service is an integral part of such program, and such institution has so certified to the employer, except that this subparagraph shall not apply to service performed in a program established for or on behalf of an employer or group of employers, or

(D) service performed in the employ of a hospital, if such service is performed by a patient of such hospital;