Which of the following minerals are found in a natural way in the State of Chhattisgarh? 1. Bauxite 2. Dolomite 3. Iron ore 4. Tin Select the correct answer using the code given below:

1. (a)1, 2 and 3 only
2. (b)1 and 3 only
3. (c)2 and 4 only
4. (d)1, 2, 3 and 4