Examine the following ideological and structural concepts to determine which have been formally elevated to the status of unamendable 'Basic Features' by the Indian judiciary:
1. The architectural doctrine enforcing the Separation of Powers between the legislative, executive, and judicial branches.
2. The overarching socio-economic commitment to sustaining a Welfare State based on equitable justice.
3. The structural preservation of the Federal character defining the relationship between the Union and the States.
4. The philosophical guarantee protecting the inherent freedom and dignity of the individual.