(c) If a contractor elects to use a unified license and permit bond under this Act and the territory of a municipality where a contractor seeks to do or is doing work is included within more than one county, then the contractor shall obtain a unified license and permit bond from each county and shall file a unified bond with each of the respective county clerks whether or not the contractor seeks to do or is doing work in that part of the municipality included in only one of the counties. In addition, the contractor shall file a certified copy of the unified bond with the clerk in the municipality within that county where the contractor seeks to do work or is doing work. At the time of the filing, the clerk may charge a reasonable administration fee, determined by the corporate authorities of the municipality.