; (B) a biological connecting corridor designated under title II; or (C) a recovery area designated under title IV. (2) Partial donation A person holding a valid permit or lease for a grazing allotment partially located in an area described in paragraph (1) may elect to donate only the portion of the permit or lease that is within the applicable area. (b) Termination With respect to each permit or lease donated under subsection (a), the Secretary concerned shall— (1) terminate the permit or lease or portion of the permit or lease, as applicable; and (2) except as provided in subsection (c), ensure a permanent end to grazing on the land covered by the permit or lease or portion of the permit or lease. (c) Common allotments (1) In general If the land covered by a permit or lease donated under subsection (a) is covered by an additional valid permit or lease that is not donated under that subsection, the Secretary concerned shall reduce the authorized level on the land covered by the permit or lease to reflect the donation of the permit or lease under that subsection. (2) Authorized level To ensure that there is a permanent reduction in the level of grazing on the land covered by the permit or lease donated under subsection (a), the Secretary concerned shall not allow grazing use on the covered land to exceed the authorized level established under paragraph (1). (d) Partial donation If a person holding a valid permit or lease donates less than the full level of grazing use authorized under the grazing permit or lease under subsection (a), the Secretary concerned shall— (1) reduce the authorized grazing level to reflect the donation