Of the Following Loans Made by a National Bank, Which

Of the following loans made by a national bank, which loan is NOT covered by the OCC ARM regulation?

A) A loan to purchase a single-family dwelling to be used as a residence, secured by the dwelling with an adjustable interest rate
B) A loan made to purchase a mobile home to be used as rental property, secured by the home with a variable interest rate
C) A loan made to purchase an eight-unit apartment complex, secured by the building, made payable on demand with a variable rate of interest
D) A loan made to purchase a duplex, secured by the dwelling, amortized over 15 years with a 5-year maturity, at a variable rate of interest