What is necessary for each of the firewalls to allow private IP addresses to be passed on to the Internet?

Masquerading is a technique used in networking that enables private IP addresses to be translated into a public IP address before the data packets are sent to the Internet. This is crucial for maintaining the security and integrity of private networks while allowing their devices to communicate with external resources.

When devices within a private network, which operates on non-routable IP addresses, need to access the Internet, it's essential that their private addresses are not exposed to the public. Masquerading accomplishes this by replacing the sender's private IP address with the public IP address of the firewall or router that connects the private network to the Internet.

This not only helps in conserving the limited number of available public IP addresses but also provides a layer of security, as it keeps the internal network structure hidden from potential attackers on the Internet. By using masquerading, the firewall ensures that return traffic is routed back to the initiating device on the private network.

In contrast, the other choices do not directly relate to the specific task of facilitating the passage of private IP addresses to the Internet. For instance, stateful multi-layer inspection is more focused on tracking the state of active connections and providing advanced security, while DMZ creation pertains to setting up a demilitarized zone for additional