The advertisement must state what type of fuel is required and when the bids will be opened and passed upon by the board of county commissioners. The bids may be opened and passed upon at a regular or adjourned session of the board, or at a meeting called by the county auditor as provided in section 11-11-05. The bid of the lowest responsible bidder must be accepted, but the board may reject any or all bids.
N.D.C.C. § 11-11-27