The United Nations Conference on Environment and Development (UNCED), also known as the ‘Earth Summit,’ was held in Rio de Janeiro, Brazil, from 3-14 June 1992. Which of the following combinations of statements about the conference is correct?
i. This global conference was held on the occasion of the 20th anniversary of the first human environment conference held in Stockholm, Sweden.
ii. It focused on the "impact of human socio-economic activities on the environment."
iii. Representatives from 79 countries participated in the conference.