In which two ways does the BGP graceful capability preserve prefix information during a restart？（）
- AThe peer router immediately removes the BGP routers that it learned from the restarting router from itsBGP routing tables.
- BThe router establishes BGP sessions with other routers and relearns the BGP routes from others that are also capable of graceful restart. The restarting router waits to receive updates from the neighboringrouters. When the neighboring routers send end-of-RIB messages to indicate that they are donesending updates，the restarting router starts sending its own updates.
- CThe peer router sends an end-of-RIB message to the restarting router.
- DThe restarting router removes any stale prefixes after the timer for stale entries expires.
- EThe restarting router does not remove any stale prefixes after the timer for stale entries expires.