Which two actions ensure voice quality in a branch location with a low-speed, high-latency WAN connection? (Choose two.)

Increasing WAN bandwidth may reduce congestion but does not address high latency, and is not always a feasible branch option - it does not solve serialization delay caused by large packets.

Increasing memory on the branch switch affects local buffer capacity and has no effect on WAN link latency or voice packet scheduling.

Fragmenting large data packets using LFI (Link Fragmentation and Interleaving) prevents serialization delay on slow WAN links, where a single large packet can occupy the link long enough to cause perceptible delay for voice. Fragmentation limits the maximum time any packet blocks the link, directly reducing jitter and mouth-to-ear delay.

Replacing electrical links with optical links improves local segment performance and reliability but does not change the speed or latency of the WAN connection itself.

Prioritizing voice packets with QoS mechanisms such as LLQ (Low Latency Queuing) ensures voice traffic is dequeued and transmitted before data traffic on a congested WAN link, directly reducing delay and jitter to within acceptable VoIP thresholds.