Final answer:
Open market operations by central banks such as the Reserve Bank of Australia typically include repo transactions, buying and selling government securities, and conducting FX transactions to manage monetary policy, with options i, ii, and iii being correct.
Step-by-step explanation:
Open market operations involve a central bank, like the Reserve Bank of Australia, conducting activities such as buying and selling government securities to influence the money supply and interest rates. These operations are an essential tool for managing the monetary conditions in the economy and securing the central bank's target interest rate. For the Reserve Bank of Australia, the activities that represent open market operations include repo transactions based on nominated debt securities, the direct purchase or selling of Commonwealth Government Securities, and entering the foreign exchange (FX) market to conduct FX transactions.
Therefore, the correct response to the multiple-choice question identifying forms of open market operations is option d, which includes repo transactions on nominated debt securities (i), direct purchase or sale of Commonwealth Government Securities (ii), and participation in the FX market to conduct FX transactions (iii).