Public Enterprises in India are generally classified into three main forms: Departmental Undertakings, Statutory Corporations, and Government Companies. The audit of these enterprises is primarily conducted or overseen by the Comptroller and Auditor General of India (CAG), adapted to their specific legal structure. Options A, B, and D correspond to the audits of these three types of public enterprises. Co-operative societies are distinct legal entities formed under Co-operative Societies Acts, and while they may receive government support, they are not typically categorized as public enterprises in the same vein. Their audit is governed by co-operative law and procedures, separate from the audit framework for state-owned enterprises.