Identify the primary philosophical and structural rationale justifying the incorporation of a 'single citizenship' framework within the Indian Constitution:
1. An administrative requirement designed primarily to reduce the bureaucratic financial burden of printing separate provincial constitutions.
2. A geopolitical strategy intended to strictly replicate and maintain the centralized federal provisions that governed British colonial rule.
3. A unifying mechanism deliberately engineered to ensure equitable distribution of political and civil rights nationwide, thereby mitigating regional discrimination.