Who monitors Priority Sector Lending (PSL) in commercial banks?

Who monitors Priority Sector Lending (PSL) in commercial banks?
[A]Reserve Bank of India (RBI)
[B]Small Industries Development Bank of India (SIDBI)
[C]National Bank for Agriculture and Rural Development (NABARD)
[D]Government of India (GOI)

Reserve Bank of India (RBI)
The priority sector lending by commercial banks is monitored by Reserve Bank of India (RBI) through periodical returns received from them.