Business question

Which of the following is a prohibited business practice under Alberta's Consumer Protection Act? Select one: O a. A contract for the purchase of a vacuum cleaner from a door-to-door salesman that prohibits cancellation anytime after signing O b. A pre-paid gift card that decreases in value after each year of non-use O C. A cable company that automatically upgrades their client's services/access (and charges additional fees but gives customers the opportunity to opt-out afterward O d. All of the above practices are prohibited under the Act