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.