Any member in service who (i) is credited with at least twenty years of service in a hazardous duty position and (ii) meets the (a) requirements for a disability retirement allowance under § 51.1-156 and (b) minimum age requirements of § 51.1-205 may elect to receive the higher of the disability retirement allowance payable under Article 9 (§ 51.1-152 et seq.) of Chapter 1 of this title or the service retirement allowance payable under § 51.1-206 less any reduction in allowance required by subsection C of § 51.1-157 or § 51.1-158.