AutoQoS is used to implement VoIP in the enterprise, but the trust option is not configured on the interface. Which network management Cisco IOS capability classifies the voice traffic?

NetFlow collects traffic statistics and flow records but does not perform real-time classification or enforce QoS policies on individual packets.

SNMP is a network management protocol used for polling device metrics and receiving traps; it has no role in per-packet traffic classification.

IP SLAs actively generates synthetic test traffic to measure network performance metrics like delay and jitter; it does not classify existing application traffic.

Without a trust boundary set on the interface, AutoQoS cannot rely on DSCP or CoS markings already present in the packets, so it invokes NBAR to perform deep packet inspection and identify VoIP traffic (such as RTP streams and H.323/SIP signaling) based on protocol signatures.