Explanation:

- Internal Audit:

- Conducted by the internal audit staff.

- Focuses on evaluating internal controls, risk management, and governance processes.

- Continuous process, providing analysis, recommendations, and advice to management.

- Correct Answer:

- Cost Audit:

- Involves the verification of cost accounts and the examination of cost records.

- Typically carried out by external auditors specializing in cost audits.

- Secretarial Audit:

- Focuses on compliance with various legal and procedural requirements.

- Usually performed by company secretaries or external professionals.

- Tax Audit:

- Required to verify the correctness of taxpayer's income and deductions.

- Generally conducted by external tax auditors.