; and (ii) covers land enrolled in the conservation reserve program under the grasslands initiative described in section 1231(d)(2). (B) Expiring contracts On the expiration of a covered contract, an owner or operator party to the covered contract shall elect— (i) not to reenroll the land under the contract; (ii) to offer to reenroll the land under the contract if the land remains eligible under the terms in effect as of the date of expiration; or (iii) not to reenroll the land under the contract and to enroll that land through a Grassland 30 contract under this subsection. (C) Unexpired contracts Prior to the expiration of a covered contract, an owner or operator party to the covered contract may elect to terminate the contract and to enroll that land through a Grassland 30 contract under this subsection. (4) Term The term of a Grassland 30 contract shall be 30 years. (5) Agreements To be eligible to enroll land in the conservation reserve program through a Grassland 30 contract, the owner of the land shall enter into an agreement with the Secretary— (A) to implement a conservation reserve plan developed for the land; (B) to comply with the terms and conditions of the contract and any related agreements; and (C) to temporarily suspend the base history for the land covered by the contract. (6) Terms and conditions of Grassland 30 contracts (A) In general A Grassland 30 contract— (i) shall include terms and conditions that promote sustainable grazing systems, protect and enhance soil carbon levels, and are compatible with wildlife habitat conservation, as determined by the Secretary