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The CRO of a hedge fund asks the risk team to develop a term-structure model for fitting interest rates that is appropriate to use in the fund's options pricing practice. The risk team is evaluating a Ho-Lee model with time-dependent drift, and a Cox-Ingersoll-Ross model with time-dependent volatility. Which of the following is a correct description of the specified model?
A
In the Ho-Lee model, the drift of the interest rate process is presumed to be constant.
B
In the Ho-Lee model, when the short-term rate is above its long-run equilibrium value, the drift is presumed to be negative.
C
In the Cox-Ingersoll-Ross model, the basis-point volatility of the short-term rate is presumed to be proportional to the square root of the rate.
D
In the Cox-Ingersoll-Ross model, the volatility of the short-term rate is presumed to decline exponentially to a constant long-run level.