A.Port 3/12 was already up and forwarding before the loop was created.
B.Port priority is based on lowest priority and lowest port number.
C.You connected the wire on port 3/18 last.
D.None of the above， it is purely random.
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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
A.Only use fiber in pairs.
B.Configure root guard on your switches.
C.Do not use fiber but use copper.
D.Configure UDLD to prevent one-way link conditions.
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