What are the Virtual machine’s available Disk Modes: (Select four)

A.
Persistent

B.
Nonpersistent

C.
Semipersistent

D.
Undoable

E.
Unchangable

F.
Append

G.
Re-do

Explanation:

A property of a virtual disk that defines its external behavior but is completely invisible to the guest operating system.
There are four modes:
persistent (changes to the disk are always preserved across sessions),
nonpersistent (changes are never preserved),
undoable (changes are preserved at the user’s discretion) and
append (similar to undoable, but the changes are preserved until a system administrator deletes the redo log file).