The regular term of office for handler members of the commission is three years, commencing April 1 of any year in which they are appointed, and, except with respect to the first of the members, each serves as follows:
(a) District 1: one serves for three years.
(b) District 2: one serves for one year, one serves for two years, and one serves for three years.
(c) District 3: two serve for two years and one serves for three years.
(d) District 4: one serves for one year, two serve for two years, and two serve for three years.
(e) District 5: one serves for two years and one serves for three years.