; (B) register each such agreement with the Secretary, include in such registration such information as shall be specified by the Secretary, and make available such agreement upon request by the Secretary; (C) ensure the compliance of each such agreement with the requirements of this section to prevent drug diversion in violation of subparagraph (B) of paragraph (5) and to prevent duplicate discounts in violation of subparagraph (A) of such paragraph before utilizing the services of the contracted entity, including by— (i) developing and implementing, with each contracted entity subject to such an agreement, a system to verify eligibility of patients (as so defined) of the entity; (ii) developing and implementing, with each such contracted entity, a mechanism for tracking the inventory of covered outpatient drugs that are subject to an agreement under this section that is suitable to prevent diversion in violation of subparagraph (B) of paragraph (5) and to prevent duplicate discounts in violation of subparagraph (A) of such paragraph, such as a separate inventory for such drugs; and (iii) establishing a mechanism with each such contracted entity and each applicable State Medicaid agency that is suitable to prevent duplicate discounts for covered outpatient drugs that are subject to an agreement under this section, including such drugs dispensed to enrollees of Medicaid managed care organizations, and complies with regulations on methodologies to prevent duplicate discounts issued by the Secretary