The boundaries of a school district may not be changed except:
(1) Pursuant to ORS 330.090 (1) or (3).
(2) By a vote of the people pursuant to the lengthening of the course of study under ORS chapter 335.
(3) By the mutual consent of the district school boards of the two or more affected districts in the manner prescribed in ORS 330.080 to 330.107.
(4) On a request for change or merger proposal submitted to the district boundary board by electors of the affected districts in the manner prescribed in ORS 330.080 to 330.107.