Which of the following statements are correct?1. Lignite and low grade bituminous coal were formed during the Quaternary period.2. Dolomite is used as refractory material and flux in iron and steel industry.3. Chhotanagpur plateau is the most extensive, rich and diversified mineral belt. Select the correct answer using the codes given below: Codes

Examples of mineral resources are iron, diamond, gold, silver, copper, aluminium, granite, marble, gypsum, clay, salt, rare earth elements, or fossil fuels (coal, oil, natural gas).
Fact: The Democratic Republic of Congo is considered the world's richest country in terms of wealth in natural resources. Most of the raw mineral deposits remain untapped and are worth an estimated $24 trillion. These deposits include the world's largest coltan reserves and considerable amounts of cobalt.