Solution:The G20 is an intergovernmental forum comprising 19 countries, the European Union (EU), and the African Union (AU). Hence, statement (i) is not true.G20 has not a permanent headquarter or secretriat. Hence, statement (ii) is also not true.
Statement (iii) is correct as with reference to groups made for electing G20 President, India is part of Group-2 with Russia, South Africa and Turkey (officially 'Turkiye'). Other four groups' members are as follows:
Group 1
Australia, Canada, Saudi Arabia, USA
Group 3
Argentina, Brazil, Mexico
Group 4
France, Germany, Italy, UK
Group 5 :
China, Indonesia, Japan, South Korea