Which statement best describes the overall, long-term cost of a cloud-based business management system?

a. The cost is lower than it is for other systems because there is no need to buy computer hardware for the system. b. The cost is difficult to estimate because the cloud storage provider can raise its subscription fees multiple times. c. The cost is about the same as for other systems because any customization must be done by highly skilled IT professionals. d. The cost is higher than it is for other systems because vast amounts of data must be transmitted online.