Who experimentally demonstrated the quantisation of electric charge?

The correct answer is Option (2) → Millikan

NCERT (2026-27):
Quantisation of Charge – “The fact that electric charge is always an integral multiple of e is termed as quantisation of charge. … The quantisation of charge was first suggested by the experimental laws of electrolysis discovered by English experimentalist Faraday. It was experimentally demonstrated by Millikan in 1912.”