What bit should be set in the link state PDUs in an IS-IS level-1-2 router to indicate that they are a potential exit point out of the area ?

A.
ATT (Attached )bit

B.
IS-Type bits

C.
P(Partition) bit

D.
Down bit

E.
PN (Pseudonode )biy

F.
ABR (Area Border Rorter ) bit