When the GR Restarter performs the active/standby switchover, the neighbor performs which of the following operations wh

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When the GR Restarter performs the active/standby switchover, the neighbor performs which of the following operations when detecting that a TCP disconnection? (Choose three.)

A. Keeping the routing tables of various address families advertised by the GR Restarter during negotiation, marking entries in these tables with stale tags, and starting a stale timer
B. Starting a restart timer.
C. Clearing all routing entries and forwarding entries related to the GR restarter if the GR restarter fails to re-establish the BGP connection with the neighbor after the restart timer expires.
D. Remaining the neighbor relationship unchanged.