Which three factors have the biggest influence on OSPF scalability？（）
A. Flooding paths and redundancy
B. Amount of routing information in the OSPF area or routing domain
C. Number of routers with Cisco Express Forwarding enabled
D. Number of neighbor adjacencies
E. Other routing protocols in use
F. OSPF timer reconstruction negotiation
G. Redistribution with BGP neighbors
H. Redistribution with other IGP routing protocols， such as RIP or EIGRP
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