Open market operations, one of the measures taken by RBI in order to control credit expansion in the economy means ?
OMO = Liquidity control mechanism by RBI. Sell securities → absorb money; Buy securities → release money.
Test each option against what "open market operations" actually refers to in monetary policy.
Open market operations specifically mean the sale or purchase of government securities by the central bank.
So, the correct answer is Sale or purchase of Govt. securities.