Who does the applicant filing for a vacancy file with?

The correct answer is that the applicant filing for a vacancy submits their application to the County Surveyor. This is because, in the context of land surveying, the County Surveyor is typically responsible for overseeing land surveying practices within a specific county, including managing applications related to vacancies for surveying positions.

The role of the County Surveyor includes ensuring that all surveying activities comply with local ordinances and state laws, which establishes their authority in processing applications for vacancies in surveying positions. By filing with the County Surveyor, the applicant ensures that their application is handled by the appropriate authority with the expertise and jurisdiction relevant to the surveying field.

In contrast, the other options do not pertain to the specific responsibilities associated with surveying vacancies. The County Treasurer deals primarily with financial matters, while the County Auditor oversees fiscal operations and financial audits. The State Surveyor, while involved in broader surveying standards and state-level issues, is not the specific local authority where an applicant would file for a vacancy at the county level. Therefore, the proper channel for filing such applications is the County Surveyor, making that the correct answer.