(a) Except as otherwise provided in this charter, the city council, by ordinance, shall prescribe the functions or duties, and establish, abolish, alter, consolidate or leave vacant all nonelective offices, positions of employment, departments, and agencies of the city, as necessary for the proper administration of the affairs and government of this city.

(b) Except as otherwise provided by this charter or by law, the directors of departments and other appointed officers of the city shall be appointed solely on the basis of their respective administrative and professional qualifications.

(c) All appointive officers and directors of departments shall receive such compensation as prescribed by ordinance.

(d) There shall be a director of each department or agency who shall be its principal officer. Each director shall, subject to the direction and supervision of the mayor, be responsible for the administration and direction of the affairs and operations of that director's department or agency.

(e) All appointive officers and directors under the supervision of the mayor shall be nominated by the mayor with confirmation of appointment by the city council. All appointive officers and directors shall be employees at will and subject to removal or suspension at any time by the mayor, with the approval of the city council, unless otherwise provided by law or ordinance.