On Cisco routers, how is hierarchical QoS implemented?

On Cisco routers, how is hierarchical QoS implemented?
A . Within the parent policy, reference another child policy using the policy-map command.
B . Within the child policy, reference another parent policy using the policy-map command.
C . Use the policy-map command within a service-policy to implement nested policy-maps.
D . Within the parent policy-map, reference another child policy-map using the service-policy command.

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Answer: D