Which statement is correct regarding greenhouse gases?
I. A greenhouse gas (GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range
II. Water vapour contributes to 36-72% of Greenhouse effect
III. Nitrous Oxide contributes to about 10% of Greenhouse effect
IV. Ozone contributes to 3-7% of Greenhouse effect
(a) I & II (b) I, II & III (c) I, II & IV (d) All the above