Which role can HP Intelligent Resilient Framework (IRF) play in a three-tier network topology?

A.
IRF can enhance a three-tier network by replacing the legacy aggregation layer with a more
efficient BladeSystem-based aggregation layer.

B.
IRF can operate at the core and aggregation layers and optimize performance at these layers,
but it cannot operate at the access layer.

C.
IRF can operate at some or all layers in a 3-tier network topology, optimizing the legacy
topology for customers who require it.

D.
IRF is not available in aggregation layer switches so the benefits of IRF are not available in a
three-tier topology.