Which model best fits the following features?

a) A change in a country's nominal interest rate is caused by a rise in the expected real interest rate, and the domestic currency appreciates.

b) A change in the domestic money supply results from an increase in the central bank's bond purchases, and long-term interest rates decrease.

Options:
a) Mundell-Fleming model
b) IS-LM model
c) Loanable Funds model
d) Aggregate Demand-Aggregate Supply model