If the binomial model is extended to multiple periods for a fixed option life, which of the following adjustments must be made?

If the binomial model is extended to multiple periods for a fixed option life, which of the following adjustments must be made? 




a. the up and down factors must be increased
b. the risk-free rate must be increased
c. the up and down factors and the risk-free rate must be decreased
d. the initial stock price must be proportionately reduced
e. none of the above





Answer: C


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