Refer to the exhibit. Which two options provide the best loop protection in this topology, regardless of a bridged domain configuration? (Choose two.)

PVRSTP operates on a per-VLAN basis, so its loop protection topology is determined by how VLANs and bridged domains are configured, directly violating the 'regardless of bridged domain configuration' requirement.

REP (Resilient Ethernet Protocol) is Cisco's proprietary ring protocol that blocks one segment in the ring to prevent loops and provides sub-50ms convergence without relying on per-VLAN or bridged domain configuration. It operates at the ring topology level rather than per-VLAN, so loop protection is guaranteed regardless of how bridged domains are defined.

MST maps VLANs to spanning tree instances, meaning its loop-prevention behavior depends on MST instance assignments and VLAN mappings rather than being independent of the bridged domain configuration.

BPDU guard is an edge-port protection feature that err-disables a port upon receiving a BPDU, making it destructive on inter-switch ring links where BPDUs are expected and required for topology management.

ITU-T G.8032 Ethernet Ring Protection Switching (ERPS) is a standards-based ring protocol that blocks one link in the ring using a Ring Protection Link, preventing loops with fast failover. Like REP, it is independent of VLAN or bridged domain configuration, making it universally applicable to the A-B-C-D ring depicted.