"PQ gives priority queues absolute preferential treatment over low priority queues; important traffic, given the highest priority, always takes precedence over less important traffic. Packets are classified based on user-specified criteria and placed into one of the four output queues--high, medium, normal, and low--based on the assigned priority."
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_conmgt/configuration/xe-16-5/qos-conmgt-xe-16-5-book/qos-conmgt-oview.html
Definitely C and E. It's the definition of Priority Queueing (PQ).
Priority Queueing (PQ) allows you to define how traffic is prioritized in the network. You configure four traffic priorities. You can define a series of filters based on packet characteristics to cause the router to place traffic into these four queues; the queue with the highest priority is serviced first until it is empty, then the lower queues are serviced in sequence.
C and E are the correct answer
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_conmgt/configuration/xe-16-5/qos-conmgt-xe-16-5-book/qos-conmgt-oview.html#:~:text=to%2064%20classes-,4%20queues,-Kind%20of%20Service
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