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

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 SA

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Answer: B,E,F