An engineer wants to configure WebEx to adjust the precedence and override the QoS profile on the WLAN. Which configuration is needed to complete this task?

Changing the AVC application entry for WebEx-app-sharing to use the 'mark' action instructs the WLC to re-mark DSCP on that application's traffic, which takes precedence over the WLAN QoS profile. AVC profiles are applied per WLAN and provide granular per-application QoS overrides that the WLAN-level QoS policy alone cannot achieve. This is the correct mechanism to adjust application-level precedence and override the existing QoS profile specifically for WebEx traffic.

Creating an ACL for WebEx controls traffic flow with permit/deny rules but does not modify DSCP markings or override the QoS profile.

Changing the WLAN reserved bandwidth for WebEx allocates bandwidth but does not alter application-level DSCP markings or override the QoS profile precedence.

Creating an AVC profile with a lower DSCP value would decrease WebEx priority rather than adjust its precedence or properly override the existing QoS profile.