单选题In BGP graceful restart， how does a peer router indicate the end of a route exchange？（）AAn open message with the E bit set.BAn update message with the E bit set.CAn open message with an end-of-RIB marker.DAn update message with an end-of-RIB marker.
单选题
In BGP graceful restart， how does a peer router indicate the end of a route exchange？（）
A
An open message with the E bit set.
B
An update message with the E bit set.
C
An open message with an end-of-RIB marker.
D
An update message with an end-of-RIB marker.
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