(a) Base Offense Level:
(1) 6 levels lower than the offense level for the underlying offense, except as provided in subdivisions (2) and (3).
(2) The base offense level under this guideline shall be not less than level 4.
(3) (A) The base offense level under this guideline shall be not more than level 30, except as provided in subdivision (B).
(B) In any case in which the conduct is limited to harboring a fugitive, other than a case described in subdivision (C), the base offense level under this guideline shall be not more than level 20.
(C) The limitation in subdivision (B) shall not apply in any case in which (i) the defendant is convicted under 18 U.S.C. § 2339 or § 2339A; or (ii) the