This subsection applies only to a member who is subject to Selection A (Additional member contributions). For a member whose membership started on or before June 30, 1973, the contribution rate as a percent of a member's earnable compensation is the lesser of: 2% plus the contribution rate adopted by the Board of Trustees and in effect when membership began; or 7%. For a member whose membership started on or after July 1, 1973, the contribution rate is 7% of a member's earnable compensation. For a member who under § 22-308(b)(2) of this title elects to receive full-time service credit for regular part-time employment, the contribution rate is 7% of the compensation the member would have earned had the member been a full-time employee. This subsection applies to a member who is subject to Selection B (Limited cost-of-living adjustment). For a member whose membership started on or before June 30, 1973, the contribution rate as a percent of a member's earnable compensation is the lesser of: the contribution rate adopted by the Board of Trustees and in effect when membership began; or 5%. For a member whose membership started on or after July 1, 1973, the contribution rate is 5% of a member's earnable compensation. For a member who elects under § 22-308(b)(2) of this title to receive full-time service credit for regular part-time employment, the contribution rate is 5% of the compensation the member would have earned had the member been a full-time employee. This subsection applies to a member who is subject to Selection C (Combination formula). A member’s contribution rate is as provided in § 23-212 of this article.