The member of the board of supervisors appointed pursuant to subdivision (d) of Section 120050.2 shall represent the supervisorial district with the greatest percentage of its area within the unincorporated area of the County of San Diego under the jurisdiction of the transit development board as defined in Section 120054.
Source:
Section 120051.1, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=PUC§ionNum=120051.1..