Any judge of probate in office on or after October 1, 1997, whose probate district is merged with another district on or before January 5, 2011, and who has not been elected to a term which begins at the time of, or subsequent to, such merger, (1) may elect to receive four years of credited service, as defined in subdivision (2) of § 45a-34, (2) may elect to receive a reduction of his or her retirement age of not more than four years pursuant to subsection (a) of § 45a-36, or (3) may elect any combination of credited service and reduction of retirement age under subdivisions (1) and (2) of this section, provided such combination shall not exceed four years in total. A judge of probate may elect to receive credited service or a reduction of retirement age in accordance with this section at any time once the judge becomes eligible to retire and receive retirement benefits.