; (B) does not modify the treatment of the former spouse as the beneficiary under the contract who is entitled to the survivor benefits; or (C) does not modify the treatment of the former spouse as the measuring life for the survivor benefits under the contract. (4) Permit short free look period The Secretary shall amend Q&A–17(a)(4) of Treasury Regulation section 1.401(a)(9)–6 to ensure that such Q&A does not preclude a contract from including a provision under which an employee may rescind the purchase of the contract within a period not exceeding 90 days from the date of purchase. (b) Divorce or separation instrument For purposes of subsection (a)(3), the term divorce or separation instrument means— (1) a decree of divorce or separate maintenance or a written instrument incident to such a decree, (2) a written separation agreement, or (3) a decree (not described in paragraph (1)) requiring a spouse to make payments for the support or maintenance of the other spouse. (c) Effective dates, enforcement, and interpretations (1) Effective dates (A) Paragraphs (1) and (2) of subsection (a) shall be effective with respect to contracts purchased or received in an exchange on or after the date of the enactment of this Act. (B) Paragraphs (3) and (4) of subsection (a) shall be effective with respect to contracts purchased or received in an exchange on or after July 2, 2014. (2) Enforcement and interpretations Prior to the date on which the Secretary issues final regulations pursuant to subsection (a)— (A) the Secretary (or delegate) shall administer and enforce the law in accordance with subsection (a) and the effective dates in paragraph (1) of this subsection