Subject to the provisions of subsection (b) of this section, a licensed real estate appraiser shall keep, for 5 years from the date of delivery to the client, the original or a copy of: each contract the licensee enters into for the provision of real estate appraisal services; each appraisal report the licensee prepares or signs; and all supporting data that the licensee assembles or formulates to prepare an appraisal report. If, within the 5-year period for the retention of records, a licensed real estate appraiser is given notice that an appraisal or appraisal report is involved in litigation, a new 5-year period shall start on the date of the final disposition of the litigation. On request, a licensed real estate appraiser shall make any record required to be kept under this section available to the Commission to inspect or copy.