The Reserve Bank of India (RBI) recently imposed a monetary penalty on three banks -- Rs 1.50 lakhs on Dr. Ambedkar Nagarik Sahakari Bank Maryadit, Rs 25,000 on Nagarik Sahakari Bank Maryadit, and Rs 1 lakh on Ravi Commercial bank for violating the provisions of its regulations. The banking regulator has imposed a monetary penalty for contravention of non-compliance with the directions issued to Ravi Commercial bank on exposure norms and statutory and other restrictions & KYC.

Which function of central Bank is refered to in the above paragraph.