For this part, each of the following is a
"participant" in an election—
(a) a candidate in the election;
(b) a group of candidates for the election;
(c) a registered political party that endorses a candidate in the election;
(d) a registered third party for the election;
(e) a third party that—(i) is not registered for the election; and(ii) incurs electoral expenditure for the election.