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A router has two interfaces: Ethernet 0 is connected to the LAN and Ethernet 1 is connected to the Internet.

The LAN is 20.20.20.0/24

All hosts on the LAN must be able to form TCP connections to any host on the Internet.

Hosts on the Internet may not form TCP connections to hosts on the LAN, except to port 25 of a mail server on the LAN.

The web server IP address is 20.20.20.100

Which configuration fulfills all the requirements?

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