What Is the Way That an OSPF ABR Uses to Prevent

Multiple Choice

What is the way that an OSPF ABR uses to prevent summary route information from being readvertised from an area into the network core (Area 0) ?

A) It advertises only inter-area summaries to the backbone.
B) It uses poison reverse and split horizon.
C) It only sends locally originated summaries to the backbone.
D) It compares the area number on the summary LSA to the local area.