Which three characteristics apply to IS-IS but not to OSPF? (Choose three.)

A.
encapsulates PDUs directly into a data-link frame

B.
uses a DIS and a backup DIS to present the psuedo-node on the LAN

C.
uses stubby areas to improve network scalability

D.
uses a default IOS metric of 10 on each interface

E.
runs PRC (Partial Route Calculations) to calculate IP reachability information

F.
uses an on-demand circuit to reduce the hello and LSA flooding across switched WAN links, such as ISDN