When an existing AppStack is updated, which two actions must be performed? (Choose two.)
A. A VMFS snapshot of the existing AppStack is made.
B. The original appstack is deleted.
C. The AppStack is provisioned to a virtual machine.
D. The existing AppStack is cloned to a new .vmdk.
C. and D. are correct.
The VMware App Volumes update feature makes a copy of an existing AppStack, and allows you to add more applications, update current applications, or make any other changes to the newly copied AppStack . The original AppStack still exists and is unaffected by the changes to the copy.
https://docs.vmware.com/en/VMware-App-Volumes/2.10/com.vmware.appvolumes.user.doc/GUID-366F43C3-F1BB-4E3D-AABC-A2F309A0E8D5.html