Bill White, who works as a revenue manager in Harrison Springs Hotel, is training the front desk agents on fundamentals of overbooking. He explains that overbooking may be unintentional and in such a case it will be caused by all of the following, except a. damaged rooms that turned out to be out of order after guaranteed reservations were accepted. b. inventory availability errors because of connectivity issues with various distribution channels. c. calculating the percentage of no-shows and factoring it into a formula that allows to estimate the number of rooms that management may decide to overbook. d. staff errors when entering reservations