With reference to two non-conventional energy sources called ‘coalbed methane’ and ‘shale gas’, consider the following statements : 1. Coalbed methane is the pure methane gas extracted from coal seams, while shale gas is a mixture of propane and butane only that can be extracted from fine-grained sedimentary rocks. 2. In India, abundant coalbed methane sources exist, but so far no shale gas sources have been found. Which of the statements given above is/are correct?

1. (a)1 only
2. (b)2 only
3. (c)Both 1 and 2
4. (d)Neither 1 nor 2