(2) The presiding officer shall cause the agenda to be published not more than 10 days nor less than four days before the meeting, in one or more newspapers of general circulation within the district or, if there is no such newspaper, in a newspaper of general circulation in each county in which the district is located. The presiding officer may also cause the agenda:
(a) To be posted in three public places within the district at least 10 days before the meeting; or
(b) To be published by radio and television stations broadcasting in the district as provided by ORS 193.310 and 193.320. [1971 c.268 §4]