Which protocol or mechanism provides the shortest traffic outage if the link marked with "X" fails?

Refer to the exhibit.

This Layer 2 ring has 10 VLANs with 1000 MAC addresses in each VLAN. Which protocol or
mechanism provides the shortest traffic outage if the link marked with “X” fails?

A.
PVRST

B.
REP

C.
MST

D.
G.8031

E.
BFD