A network engineer is trying to modify an existing active NAT configuration on an IOS router by using the following command: (config)# no ip nat pool dynamic-nat-pool 192.1.1.20 192.1.1.254 netmask 255.255.255.0 Upon entering the command on the IOS router, the following message is seen on the console: % Dynamic Mapping in Use, Cannot remove message or the %Pool outpool in use, cannot destroy What is the least impactful method that the engineer can use to modify the existing IP NAT configuration?