Which one of the following is not the function of NABARD ?

• A. To provide refinance assistance by way of short term credit to state cooperative banks and sectoral rural banks, etc., approved by the RBI for some specific purposes.
• B. To undertake inspection of cooperative societies other than primary cooperative societies and RRBs.
• C. To promote research in various aspects of the problems of urban development.
• D. To subscribe to share capital or invest in securities of any institution concerned with agricultural and rural development.