Option 1 -> Targets manufacturing sector to boost domestic production, not direct consumer savings.
Option 2 -> Establishes large 500 MW solar parks for utility-scale generation, not household use.
Option 3 -> Specifically designed for transforming India's agricultural sector, benefiting farmers.
Option 4 -> Explicitly designed for the residential sector, enabling households to generate their own solar power.
Hence, Option 4: Rooftop Solar Programme -> This scheme is specifically mentioned as being "for the residential sector," allowing average Indian households to install solar panels on their rooftops, generate their own electricity, and significantly reduce their monthly electricity bills and overall domestic expenditure -> correct