Within six months after the effective date of any new option available to contracting agencies, the board shall (a) notify all contracting agencies participating in risk pools of the availability and approximate cost of the new option, (b) include the new option in at least one of the risk pools applicable to each member category to which the new option may apply, and (c) notify the contracting agencies of their options if they are participating in a risk pool to which the new option is added and choose not to offer the new option to their employees.