Concept:Reverse Repo Rate is the rate at which the RBI borrows funds from commercial banks.Explanation:When banks have surplus funds, they can park them with the RBI.In this transaction, banks are effectively lending to the RBI.The interest rate paid by the RBI on such borrowing is called the Reverse Repo Rate.Therefore, the rate at which banks lend to RBI is the Reverse Repo Rate.Answer:Reverse Repo Rate (Option A).