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