Among the descriptions A through C below concerning the effects that are obtained by simultaneously running multiple virtual servers on one (1) physical computer, which of the following lists all and only the appropriate descriptions? A: Each virtual server can run an OS with a different version, and the resources of the physical computer can be utilized effectively. B: The throughput that is gained when the number of virtual servers is increased is the same as when the number of physical computers is increased by the same number. C: A volume of data that is the same as the capacity of the HDD on the physical computer can be simultaneously recorded on all of the virtual servers.