If the Federal Reserve buys dollars in the foreign exchange market but conducts an offsetting open market

Question:

If the Federal Reserve buys dollars in the but conducts an offsetting open market operation to sterilize the intervention, what will be the impact on international reserves, the money supply, and the exchange rate?

Foreign Exchange Market
The foreign exchange market (also known as forex, FX or the currency market) is an over-the-counter (OTC) global marketplace that determines the exchange rate for currencies around the world. Participants are able to buy, sell, exchange and...