[单选]
During a recent OSPF election among three routers, RTA was elected the DR and RTB was elected the BDR, as seen in the graphic. Assume that RTA fails, and that RTB takes the place of
the DR whi le RTC becomes the new BDR. What will happen when RTA comes back online？（）

A . A new election will take place establishing an all new DR and BDR based on configured priority levels and MAC addresses.
B . RTA will take the place of DR immediately upon esta blishing its adjacencies.
C . RTA will take the place of DR only if RTB fails.
D . RTA will take the place of DR only if both RTB and RTC fail.

结转和结余是指事业单位一定期间收入与支出相抵后的余额。面对服务器验证控件说法正确的是（）。可以在客户端直接验证用户输入，并显示出错信息。服务器其验证控件种类丰富共有10中之多。服务器验证控件只能在服务端使用。各种验证控件不具有共性，各自完成功能。有微量放射性的钨极是（）纯钨级。钍钨极。铈钨极。铜钨极。从研究的层次上看生态工程与环境工程的研究水平是（）水平，而生物工程是（）水平。根据《UPC500》的解释，信用证的第一付款人是（）。进口人。开证行。议付行。通知行。

During a recent OSPF election among three routers, RTA was elected the DR and RTB was elected the BDR, as seen in the graphic. Assume that RTA fails, and that RTB takes the place of
the DR whi le RTC becomes the new BDR. What will happen when RTA comes back online？（）

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[单选] During a recent OSPF election among three routers, RTA was elected the DR and RTB was elected the BDR, as seen in the graphic. Assume that RTA fails, and that RTB takes the place of the DR whi le RTC becomes the new BDR. What will happen when RTA comes back online？（）

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[单选]
During a recent OSPF election among three routers, RTA was elected the DR and RTB was elected the BDR, as seen in the graphic. Assume that RTA fails, and that RTB takes the place of
the DR whi le RTC becomes the new BDR. What will happen when RTA comes back online？（）