Consider the following statements in reference to World Meteorological Day.
1. It is celebrated on 23 March as World Meteorological Organization was established on that day in 1950.
2. The organisation comprises 150 members.
3. It is being observed by the World Meteorological Organization (WMO) and the United Nations.
4. The theme of 2020 World Meteorological Day was 'Climate and Water'.
Which of the statements given above is/are correct?