To Implement Hierarchical-QoS (Multi-Tiered Scheduling), Which of the Following Actions

To implement Hierarchical-QoS (Multi-tiered scheduling) , which of the following actions must be undertaken? (Choose three)

A) H-QoS capabilities must be enabled globally on the router
B) A scheduler-policy must be configured.
C) The queues in the SAP-ingress and SAP-egress policies do not require additional configuration attributes to make use of the hierarchical schedulers.
D) The network queue policy must be configured to make use of the scheduler-policy.
E) The scheduler-policy must be referenced in the SAP-ingress and SAP-egress policies.
F) The scheduler-policy must be applied on the service SAP.