Place the following international conventions/conferences/protocols/declarations in the chronological order $\text{(oldest to latest)}$ of their happening
i) United Nations conference in Stockholm which resulted in the establishment of the United Nations Environmental Program $\text{(UNEP)}$
ii) Vienna Convention for the Protection of the Ozone Layer
iii) United Nations climate change conference in Glasgow commonly referred as $\mathrm{COP} 26$
iv) Montreal protocol on phasing out production of substances related to Ozone layer depletion
- $\text{i, ii, iv, ii}$
- $\text{i, ii, iii, i}$
- $\text{ii, iv, i, ii}$
- $\text{iv, iii, ii, i}$
