Which of the following statements are true about the sand glass (hour glass)?(i) The first reference to sand glass in Afghanistan seems to occur in Mir Khwand's Rauzat-us Safa. (ii) By the 16th century the sand glasses in use in India were so made as to show the Indian measure of time (ghari). (iii) The sand glass begins to be shown in Mughal miniatures from Akbar's time onwards. (iv) Ramchandra's Yantra Prakasha and Jnanaraja's Sundara Siddhanta refer to sand-clock. Select the correct answer from the code given below:

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