In the FusionSphere private cloud solution, which of the following statements about the principle of virtual machine rapid release are incorrect? (Multiple Choice)

In the FusionSphere private cloud solution, which of the following statements about the principle of virtual machine rapid release are incorrect? (Multiple Choice)
A . When issuing a virtual machine, there is need to create a new system volume in the storage and copy the full amount of the mirrored content to it.
B . When issuing a virtual machine, the system only needs to quickly create a lightweight sub-volume, and constitutes the complete system volume of the virtual machine with the existing parent-volume.
C . During the use of the virtual machine, all modifications to the system volume are written to the sub-volume
D . The system volume ID that the virtual machine presents externally is the ID of the parent-volume used by it.

Answer: AD