The Board of Supervisors shall establish, where not otherwise expressly provided by the general law or this Charter, the number, qualifications, appointment, powers, and duties of all County officers and employees. Compensation of officers and employees shall be established by ordinance, resolution, memorandum of understanding, or contract. All such officers and employees, except those designated by the Board of Supervisors by ordinance, shall be in the classified service of the County and subject to civil service rules and regulations. Nothing herein shall be deemed to impinge upon any authority otherwise conferred by law upon an officer to appoint deputies. Nothing herein contained shall be deemed to limit the authority of the Board of Supervisors to employ persons for positions in the unclassified service.