What happens when the Expand line-handler object $ZZWAN.#LH1 is added to a multi-line path?

What happens when the Expand line-handler object $ZZWAN.#LH1 is added to a multi-line path?

A.
The change will be remain after cold-loads.

B.
The change will be rejected unless the line uses the same protocol as others in the path.

C.
The change may briefly disrupt communications to the adjacent node.

D.
The line will only be used in the event of failure.