Buying stock on "margin" can best be described as
A: paying for 100% of the stock your purchase upfront.
B: paying 50% of the stock's value up front and paying the other 50% over a two year period.
C: paying 10% of the stock's value upfront and taking a loan from a bank to pay for the other 90%.
D: paying for 90% of the stock's value and taking a loan from a bank for the other 10%.