Alex sold an At The Money put option on XYZ stock for $2.25. Which of the following is true? Select one: a. Alex will have to post margin on this trade b. The most Alex can lose is $2.25 c. Alex will only have to post margin if the price of XYZ rises more than $2.25 d. Margins only have to be posted for In The Money options e. Alex receives $2.25 in margin