The 73rd Amendment of the Constitution provided constitutional status to the Panchayati Raj Institutions. The main features of this provision are as follows:

I. A three-tier system of Panchayat Raj for all states: This means that there should be three levels of Panchayati Raj Institutions - village, intermediate, and district. This ensures that local self-government is established at various levels for effective governance.

II. Panchayat elections in every 5 years: This provision ensures regular and timely elections for Panchayati Raj Institutions. This allows for the democratic participation of citizens in the decision-making process.

III. Not less than 33% of seats are reserved for women: This provision aims to empower women in local governance by reserving a minimum of 33% of seats for them. This encourages gender equality and ensures women`s representation in decision-making bodies.

IV. Constitution of district planning committees to prepare development plans: This provision establishes district planning committees, which are responsible for developing plans for economic development and social justice at the district level. These committees play a crucial role in ensuring balanced and inclusive development.

Based on these features, the correct answer is option 1 - I, II, and III.