单项选择题
Refer to the exhibit. This exhibit shows the NAT configuration for Router A and the output for a ping issued from device 171.68.200.48 and destined to 172.16.47.142. Based on this information, what change must be made to Router A in order for the ping to work?（） 
A.reload the router
B.clear the route cache
C.add a static route
D.configure IP as classless
E.load a newer IOS image
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Youdeployednewfibersinyournetworktoreplacecopperspansthatweretoolong.Whilereconnectingthenetwork，youexperiencednetworkproblemsbecauseyoureconnectedwrongfiberstowrongports.Whatcouldyoudotopreventthistypeofprobleminthefuture，particularlywhenconnectingandreconnectingfiberpairs？（）
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