The correct answer is 1 and 2 only.

The constitution can be amended by:

• By a simple majority.
•  Article 368 of Part XX of the Indian Constitution provides for two types of amendments,

1. By a special majority of Parliament.
2. By a special majority of the Parliament with the ratification by half of the total states.

By Simple Majority of Parliament

• Formation of new states and alteration of areas, boundaries, or names of existing states.
• Abolition or creation of legislative councils in states.
• Second Schedule - emoluments,
• Allowances, privileges, and so on of the president, the governors, the Speakers, judges, etc.
• Quorum in Parliament.
• Salaries and allowances of the members of Parliament.
• Rules of procedure in Parliament.
• Privileges of the Parliament, its members, and its committees.
• Use of the English language in Parliament.
• A number of judges in the Supreme Court.
• Citizenship acquisition and termination.
• Elections to Parliament and state legislatures.
• Delimitation of constituencies.
• Union territories
• Fifth Schedule-administration of scheduled areas and scheduled tribes.
• Sixth Schedule-administration of tribal areas.

Special Majority

• Fundamental Rights.
• Directive Principles of State Policy.
• All other provisions are not covered by the first and third categories.

Special Majority and Ratification by half of the States:

• Election of the President and its manner.
• The extent of the executive power of the Union and the states.
• Supreme Court and high courts.
• Distribution of legislative powers between the Union and the states.
• Any of the lists in the Seventh Schedule.
• Representation of states in Parliament.
• Power of Parliament to amend the Constitution and its procedure (Article 368 itself).