Answer :
In a Central bank, auditing is an activities that is not an operations activity. The Option A is correct.
What role do Central banks plays?
The central bank is mainly described as "lender of last resort", that is, it is responsible for providing its nation's economy with funds when commercial banks cannot cover a supply shortage.
Also, the Central banks are responsible for overseeing the monetary system for a nation (or group of nations), along with a wide range of other responsibilities, from overseeing monetary policy to implementing specific goals such as currency stability, low inflation, and full employment.
In current economies, to ensure stability of a country's currency, the central bank should be the regulator and authority in the banking and monetary systems.
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