Explanation:

Recently, the Ramgarh Vishdhari wildlife sanctuary received a nod from the National Tiger Conservation Authority’s (NTCA) technical committee to become the 4th Tiger reserve of Rajasthan. This will be the 52nd Tiger Reserve of India. 

• The tigers were believed to have disappeared from the sanctuary in 1999. The sanctuary currently has leopards, sambhars, chitals, wildboars, smaller cats, caracals, chinkaras and nilgai. 
• The total area of 1,017 sq. km that has been identified as the reserve area comprising two forest blocks  
• Bhilwara, territorial forest block of Bundi and  
• Indargarh – It falls under buffer zone of Ranthambore Tiger Reserve (RTR). 

Hence option 3rd is correct.