Council shall appoint a Clerk who shall be the Clerk of Council and Secretary of the Planning and Zoning Commission, Civil Service Commission and of all Boards and Commissions established by Council. The Clerk shall keep the records of Council and of the Boards and Commissions of which the Clerk is Secretary. The Clerk shall authenticate all records, documents and instruments of the City required by law and perform other duties required by Council. Council may also appoint Assistant Clerks of Council to assist the Clerk and to act in the Clerk's absence.