As used in this article:
(a) “Complaint” means a complaint or cross-complaint.
(b) “Plaintiff” means a person who files a complaint or cross-complaint.
(c) “Related cause of action” means a cause of action which arises out of the same transaction, occurrence, or series of transactions or occurrences as the cause of action which the plaintiff alleges in his complaint.
(Added by Stats. 1971, Ch. 244.)