A user wants to configure their network to support VoIP. Which of the following would BEST support a VoIP installation?

QoS allows network devices to classify and prioritize VoIP packets over other traffic types. Because VoIP is highly sensitive to latency and jitter, QoS ensures voice packets are delivered with low delay even when the network is congested, making calls clear and uninterrupted.

POTS (Plain Old Telephone System) is the traditional analog telephone network and is a competing technology to VoIP, not a supporting one.

Wake-on-LAN is a power management feature that remotely powers on computers and has no relationship to voice traffic quality.

VPN encrypts and tunnels network traffic but adds overhead and latency, which can degrade VoIP quality rather than improve it.