At which of the following places was diamond mining carried out during the Delhi Sultanate period?

Panna in Bundelkhand (present-day Madhya Pradesh) has been India's most famous diamond mining centre since ancient times and continued to be the major source of diamonds during the Delhi Sultanate period. Khambhat (Cambay) was famous for textiles and as a port; Awadh and Lakhnauti were political-administrative centres, not diamond-mining sites.