Explanation:

Article 368 outlines the procedure for amending the Constitution, requiring a special majority in Parliament (2/3 of members present and voting, and a majority of the total membership of each house) and, for certain provisions, ratification by at least half of the state legislatures. The 'basic structure' doctrine, established in Kesavananda Bharati v. State of Kerala, holds that while Parliament can amend the Constitution, it cannot alter its basic features. A joint sitting is not used for constitutional amendments. Therefore, none of the given options accurately describe the process for amending the basic structure, as the basic structure itself cannot be altered, and the amendment procedures mentioned are incomplete or incorrect for constitutional amendments in general.