How is change approved for implementation in Smart Workflow?

A.
The change is submitted for approval and is automatically installed by the approver once Approve
is clicked

B.
The change is submitted for approval and is automatically installed by the original submitter the
next time he logs in after approval of the 3nge

C.
The change is submitted for approval and is manually installed by the original submitter the next
time he logs in after approval of the change.

D.
The change is submitted for approval and is manually installed by the approver once Approve is
clicked