When an existing AppStack is updated, which two actions must be performed? (Choose two.)

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.

Answer: C,D