What is the difference between the CUoD and Utility Capacity On Demand?（）

A. Utility allows for activation of resources by the hour. CUoD allows for permanent access to additional resources installed into the system.
B. Utility allows for permanent access to additional resources installed into the system. CuOD allows for activation of resources by the hour.
C. Utility allows for activation of resources by the minute. CUoD allows for permanent access to additional resources installed into the system.
D. Utility allows for a 30 day usage of additional resources installed into the system. CUoD allows for permanent access to additional resources installed into the system.