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