option, for eligible land described in subsection (b)(4), and any associated eligible land described in subsection (b)(5), that is to be enrolled pursuant to an agreement entered into under section 1231A(b). (2) Method of enrollment (A) General enrollment option In enrolling eligible land under the general enrollment option, the Secretary shall make the conservation reserve program available to owners or operators of eligible land on an annual enrollment basis with one or more ranking periods. (B) Continuous enrollment option In enrolling eligible land under the continuous enrollment option, the Secretary shall make the conservation reserve program available to owners or operators of eligible land on a continuous basis. (C) Grasslands enrollment option In enrolling eligible land under the grasslands enrollment option, the Secretary shall make the conservation reserve program available to owners or operators of eligible land on an annual enrollment basis with one or more ranking periods. (D) Partnership initiatives enrollment option In enrolling eligible land under the partnership initiatives enrollment option, the Secretary shall make the conservation reserve program available to owners or operators of eligible land using the methods and processes for enrollment described in the applicable agreement under section 1231A(b)(2)(A). (3) Maximum acreage enrolled (A) In general The Secretary may maintain in the conservation reserve at any one time during fiscal years 2025 through 2029 not more than 27,000,000 acres. (B) Grasslands For purposes of applying the limitations in subparagraph (A)— (i) the Secretary shall enroll and maintain in the conservation reserve not fewer than 8,000,000 acres of the land described in subsection (b)(3) by September 30, 2029