(a) In a manner consistent with rules and regulations adopted by the secretary of administration, transfers in the classified service may be made from a position in one class to a position in another class when the duties and compensation are similar.

(b) Any person holding a regular position in the classified service of this state may be granted a leave of absence on the grounds of sickness, disability or other good or sufficient reason. No leave shall exceed one year, except as necessary to comply with other laws and as approved by the secretary of administration.

(c) Leave of absence may be granted to an officer or employee holding a regular position in the classified service to enable such person to take an appointive position in the state unclassified service.