Explanation:

Correct Option: 4. Modes of winding up

Section 270 of the Companies Act, 2013, deals with the modes of winding up of a company. It outlines the various procedures through which a company can be closed or dissolved, including voluntary winding up, compulsory winding up by the tribunal, and winding up due to the inability to pay debts. This section is a part of the broader framework governing the dissolution and liquidation process, ensuring that the company's assets are appropriately distributed among its creditors and shareholders, and that the company's legal and financial obligations are settled.