Which of the following statements regarding climatic conditions of Rajasthan is/are correct? Select the correct answer using the codes given below-

i) Climatic conditions of Rajasthan exhibit extremity of temperature and rainfall.

ii) During the last ten years amount of rainfall has decreased in western desert part, while increased in Mewar.

iii) Sudden onset of South-East moisture laden winds over an intensely heated landmass is the root cause of scarce rain in Western Rajasthan.

iv) Climatically major part of Rajasthan lies in sub-tropical zone.