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?

PVRST runs a separate STP instance per VLAN and still requires port-state transitions through Discarding and Learning before forwarding, resulting in convergence times measured in seconds.

REP maintains one pre-designated blocked alternate port per ring segment and, upon detecting a link failure, immediately unblocks that port without any port-state negotiation delay. This allows forwarding to resume in milliseconds, far faster than any STP variant that must traverse Discarding-Learning-Forwarding states. The mechanism is optimized specifically for ring topologies, making it the fastest option listed for this scenario.

MST reduces the number of STP instances but its convergence speed matches RSTP and is not optimized for ring topologies the way REP is.

G.8031 defines linear (point-to-point) Ethernet protection switching, not ring protection; G.8032 is the ITU standard for Ethernet ring protection, making G.8031 architecturally mismatched for this ring topology.

BFD is a failure-detection protocol that accelerates fault discovery but does not itself perform protection switching or restore a forwarding path.