Consider the following statements : (a) The Ahar culture is a Chalcolithic culture of North-Western Rajasthan. (b) The Ahar culture has been recognized as being distinct from the Chalcolithic sites of Harappan Culture. (c) The main distribution of Ahar culture seems to be concentrated in the river valleys of Banas. (d) The technology of Ahar-people was mostly based on stone. Choose the most appropriate answer from the options given below :