How should multiple OSPF areas be designed when deployed on a classic three-layer
(core/distribution/access) network hierarchy?

A.
The OSPF flooding domain boundary should be at the edge of the core layer.

B.
The OSPF flooding domain boundary should be within the distribution layer.

C.
OSPF should generally be deployed in a three-layer domain hierarchy to align with the
physical three-layer hierarchy.

D.
OSPF flooding domain boundaries should be placed with route aggregation in mind.