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d) Conferences have played a key role in guiding the work of the UN since its inception

a) These conferences have turned into a high-profile level in need to resolve security issuers and make progress in every aspect of human development.

c) The summits involve Heads of states and governments and other high-profile world leaders from intergovernmental and non-governmental organizations.

b) UN Conference venues are designated United Nations territory and governed by the rules and regulations of the international body.