The administrator of a small branch office wants to implement the Layer 2 network without...

B (Flex Links): Flex Links provide an alternative to Spanning Tree in simple Layer 2 designs. One link is active while the other is backup, preventing loops while maintaining redundancy without running STP.

Other options explained:

A: vPC requires more advanced hardware and configuration.

C: FabricPath is typically used in data centers, not small branches.

D: 802.3ad is link aggregation, not redundant path management.