What adjustments to the contract terms of CBOE options would be made in the following situations?
a. An option has an exercise price of 60. The company declares a 10 percent stock dividend.
b. An option has an exercise price of 25. The company declares a two-for-one stock split.
c. An option has an exercise price of 85. The company declares a four-for-three stock split.
d. An option has an exercise price of 50. The company declares a cash dividend of $.75.