“Service” means uninterrupted employment of any person appointed or elected for that period of time:

1. (a) For which deductions are made from his earnable compensation from the county or district for such service while he is a member of the retirement association.
2. (b) In military service for which the county or district or member is authorized by other provisions of this chapter to make, and does make, contributions.
3. (c) For which he receives credit for county service or for public service or for both pursuant to the provisions of this article.
4. (d) Allowed for prior service.