Agendas and other writings or materials distributed prior to or during a regional center board meeting for discussion or action at the meeting shall be considered public records, except those materials distributed during, and directly related to, a closed session authorized under Section 4663. Writings which are distributed prior to commencement of a board meeting shall be made available for public inspection upon request prior to commencement of the meeting. Writings which are distributed during a board meeting shall be made available for public inspection at the time of their discussion at the meeting. A reasonable fee may be charged for a copy of a public record distributed pursuant to this section.