Which of the following statements are true about options contracts traded on an exchange, such as the Chicago Board Options Exchange (CBOEI? Select one a. None of the above are true O b. Options contracts have to be "exercised" to make money on a contract Oc When a options buyer agrees to buy a contract from an options seller, then the open interest increases d. When an option series is created, there is a zero open interest e. All of the above are true