; and (3) consist of a plan in the silver level of coverage (as described in section 1302(d)). (c) Enrollment and coverage periods The Secretary shall establish enrollment and coverage periods for individuals who enroll in the public option. Such periods shall be established, to the extent practicable, in coordination with the enrollment and coverage periods for other plans offered through an Exchange. (d) Premiums (1) Monthly premium The Secretary shall determine a monthly premium for individuals enrolled in the public option. Such monthly premium shall be equal to 1/12 of the annual premium computed under paragraph (2)(B). (2) Annual premium (A) Estimation The Secretary shall estimate the average, annual per capita amount for benefits and administrative expenses payable under this section for individuals in each age band specified in subparagraph (C) enrolled in the public option. (B) Computation The annual premium under this subsection for months in a year is equal to the average, annual per capita amount estimated under paragraph (1) for the year for each age band specified in sub­pa­ra­graph (C), geographically adjusted by rating area. (C) Age bands The age bands specified in this subparagraph are the age bands defined by the Secretary pursuant to section 2701(a)(3) of the Public Health Service Act ( 42 U.S.C. 300gg(a)(3) ). (3) Variation in premium rates The premium rate charged for the public option may not vary except as provided under section 2701 of such Act ( 42 U.S.C. 300gg ). (e) Payment of premiums (1) In general Premiums for enrollment in the public option shall be paid to the Secretary at such times, and in such manner, as the Secretary determines appropriate. (2) Deposit Amounts collected by the Secretary under this section shall be deposited in the account established under subsection (f). (f) Account (1) Establishment There is established in the Treasury of the United States an account for the receipts and disbursements attributable to the operation of the public option. (2) Prohibition of