The rock-cut cave temples in Ellora are in 32 caves, carved in Charanadri hills . It is a unique art-historical site in the country as it has monasteries associated with the three religions dating from the fifth century CE onwards to theeleventh century CE. Buddhist caves are big in size and are of single, double and triple storeys . Their pillars are massive. Ajanta also has excavated double-storeyed caves but at Ellora, the triple storey is a unique achievement . Hence, option 3 is correct. The patrons of these caves range from the dynasties of Chalukyas to Rashtrakutas . Hence, option 4 is correct. The Ellora caves were designated as a UNESCO World Heritage Site in 1983 . Hence, option 2 is correct.