What is a possible reason this delay?

Cisco APIC-EM is used to add a network-wide marking policy for Cisco Spark users who are connected to a Cisco Catalyst 6500 device. After this change, wireless users complain about a delay in other applications.

What is a possible reason this delay?
A . The DSCP-to-CoS mappings were configured incorrectly.
B . The policy was also deployed to the WLAN controller and overrode the policies of other applications.
C . You cannot automate policy for more than one real-time application at a time.
D . Policy automation cannot be deployed for wireless and wired elements at the same time.

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