Route redistribution (RR) has become an integral part of IP network design as the res ult of a growing need for disseminating certain routes across routing protocol boundaries. By default, which description is true when redistributing routes from other routing protocols into OSPF?（）

A. Summarized routes are unacceptable
B. They will appe ar in the OSPF routing table as type E2 routes
C. Only routes with lower administrative distances will be imported
D. All imported routes are to be automatically summarized if possible