In the case of an eligible teacher who is described in paragraph (1) and who is certified by the National Board for Professional Teaching Standards for the eligible academic year, paragraph (1)(A) shall be applied by substituting $2,000 for $1,000 . (3) Eligible school leaders in schools in rural areas In the case of an eligible school leader who serves in a public kindergarten or a public elementary or secondary school described in paragraph (1)(B)(ii), paragraph (1)(A) shall be applied by substituting $2,000 for $1,000 . (c) Eligible teacher For purposes of this section, the term eligible teacher means, for any eligible academic year, an individual who is a kindergarten through grade 12 classroom teacher or instructor in a public kindergarten or a public elementary or secondary school on a full-time basis for such eligible academic year. (d) Eligible school leader For purposes of this section, the term eligible school leader means, for any eligible academic year, an individual who, on a full-time basis for such eligible academic year, is a kindergarten through grade 12 principal or assistant principal in a public kindergarten or a public elementary or is a school superintendent or other administrator employed by a local educational agency. (e) Additional definitions For purposes of this section— (1) Elementary and secondary schools