The correct answer is "Commerce in Information Technology". This means that one of the significant agreements reached during the 1996 Ministerial Conference of World Trade Organization (WTO) pertained to the establishment of guidelines and rules surrounding international trade in the field of information technology.

Option-2, "Multilateral Agreement on Investment", while important, was not the focus of the 1996 conference.

Option-3, "Multi-fibre Agreement", relates to policies on international trade in textiles, not specifically covered in this particular conference.

Option-4, "Exchange of Technical Personnel", is a concept that may be incorporated in broader topics of discussion at WTO conferences, however it was not the major subject of the 1996 Ministerial Conference.

So, in summary, in 1996, the WTO`s Ministerial Conference chiefly made decisions on issues related to "Commerce in Information Technology".