Who declared the Instrument of Accession to India as illegal and fraudulent?

Who declared the Instrument of Accession to India as illegal and fraudulent?
Past Papers: PMS Combined Competitive Examination — Past Paper MCQs
A: Quaid-e-Azam
B: Liaqat Ali Khan
C: Raja Ghazanfar Ali
D: Abdur Rab Nishtar

Quaid-e-Azam Muhammad Ali Jinnah labeled Kashmir’s Instrument of Accession to India in 1947 as illegal; contesting its legitimacy. Others didn’t make this claim. This stance fuels the Kashmir dispute; key for studying Pakistan’s position on sovereignty and international law.