Which of the following features of the Nokia 7750 SR prevents Head of Line blocking...

Every forwarding class can be associated with its own queue without sharing with other forwarding classes.

A 3-tier scheduling policy can be applied at SAP-ingress/SAP-egress.

For each unicast queue in a SAP-ingress or network-queue policy, there is a separate hardware queue for each destination FFPC.

Policing can be deployed instead of queuing at ingress.