The principal purposes of the Audit Committee are to oversee (i) the quality and integrity of Vistra’s financial statements, the financial reporting processes, and financial statement audits, (ii) the independent auditor’s qualifications and independence, (iii) the performance of the company’s internal audit function and independent auditor, the systems of disclosure controls and procedures, and the company’s system of internal controls over financial re porting, accounting, legal and regulatory compliance, and ethics.