educational assistance

(A) the payment, by an employer, of expenses incurred by or on behalf of an employee for education of the employee (including, but not limited to, tuition, fees, and similar payments, books, supplies, and equipment),

(B) the payment by an employer, whether paid to the employee or to a lender, of principal or interest on any qualified education loan (as defined in section 221(d)(1)) incurred by the employee for education of the employee, and

(C) the provision, by an employer, of courses of instruction for such employee (including books, supplies, and equipment),