People are having intermittent quality issues during a live meeting via web application.

People are having intermittent quality issues during a live meeting via web application.
A . Use QoS profile to define QoS Classes
B . Use QoS Classes to define QoS Profile
C . Use QoS Profile to define QoS Classes and a QoS Policy
D . Use QoS Classes to define QoS Profile and a QoS Policy

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Answer: C