When a voice-enabled QoS STA sends an IP data packet to a voice server in this scenario, the DSCP value carried in the STA’s IP data packet gets mapped to what and by which device?

ABC Company has a WLAN controller with 10 controller-based APs; the Voice SSID is configured for centralized data forwarding. Each AP is connected to an access port on a layer-2 Ethernet switch. Each layer-2 switch is uplinked to a single layer-3 core Ethernet switch. The WLAN controller is connected directly to the layer-3 core Ethernet switch. Layer-3 tunnels are created between all controller-based APs and the WLAN controller. A voice server is connected to the layer-3 Ethernet switch.

When a voice-enabled QoS STA sends an IP data packet to a voice server in this scenario, the DSCP value carried in the STA’s IP data packet gets mapped to what and by which device?
A . The DSCP value is mapped to an IEEE 802.1Q priority tag value by the WLAN controller.
B . The DSCP value is mapped to the DSCP value in the encapsulating IP header by the layer-3 switch.
C . The DSCP value is mapped to an IEEE 802.1p (802.1D-2004) UP value by the access point.
D . The DSCP value is mapped to an IEEE 802.1Q VLAN tag by the access point.

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Answer: A