In the event the board elects to adopt and maintain its own retirement system, that system shall comply with this article and the requirements of: (1) Article 2 (commencing with Section 95830), Article 3 (commencing with Section 95860) and Article 4 (commencing with Section 95890) of this chapter; or (2) applicable federal law to establish a qualified plan under Section 401 (a) of, and a tax exempt trust under Section 501 (a) of, the Internal Revenue Code of 1954, as amended.