The county director shall:
(a)
Serve as the executive and administrative officer of the county department. The county director may delegate his powers and functions to any member of his staff.
(b)
Establish such administrative units as he may deem necessary or desirable for the proper and efficient administration of the county department, and employ such personnel as may be authorized subject to merit system regulations and the state standards established pursuant to Section 19801 of the Government Code.
(c)
Perform such other duties as may be prescribed by law, and, except for Section 10801, such other administrative and executive duties pertaining to the public social services as may, by other provisions of law, be imposed upon the board of supervisors.
(d)
Perform such other duties as may be prescribed by the board of supervisors.