Can I get help on Optimal balance

Interest rate Optimal balance 9% 200 8% 300 7% 400 6% 500 5% 600 To what does optimal balance refer in the context of the 10 money market? CO O the average money balance that matches the highest rrect 00 interest rate on bonds that are traded V the highest average money balance 0% the average money balance that produces the greatest Money demand profit from trading bonds Interest rate (9%) the average money balance that has the lowest 190% A switching costs Correct