As used in this article, the term:

(1) "Contestant" means any person or persons entitled under Code Section 21-2-521 to contest the result of any primary or election.

(2) "Defendant" means:

(A) The person whose nomination or election is contested;

(B) The person or persons whose eligibility to seek any nomination or office in a run-off primary or election is contested;

(C) The election superintendent or superintendents who conducted the contested primary or election; or

(D) The public officer who formally declared the number of votes for and against any question submitted to electors at an election.