Which two statements are correct about Nonstop Forwarding？（）
A. It allows the standby RP to take control of the device after a hardware or software fault on the active R
B. It is a Layer 3 function that works with SSO to minimize the amount of time a network is unavailable tousers following a switchover.
C. It is supported by the implementation of EIGRP， OSPF， RIPv2， and BGP protocols.
D. It synchronizes startup configuration， startup variables， and running configuration.
E. The main objective of NSF is to continue forwarding IP packets following a switchover.
F. Layer 2 802.1w or 802.1s must be used， as 802.1d cannot process the Layer 2 changes.
G. Routing protocol tuning parameters must be the same as the NSF parameters， or failover will beinconsistent.
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