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