Which of the following descriptions about virtual system resource allocation is incorrect?

Which of the following descriptions about virtual system resource allocation is incorrect?
A . Unreasonable resource allocation may cause other virtual systems to be unable to obtain resources and the business to be unable to operate normally.
B . Quota resources automatically allocate a fixed number of resources directly according to system specifications.
C . When the administrator manually allocates resources to the virtual system, he first needs to configure the C resource class and specify the guaranteed value and maximum value of each resource item in the resource class, and then bind the source class to the virtual system
D . Each virtual system can share and seize the entire machine resources, but they can be allocated manually.

Answer: D