What are the two required DNS servers for the Sales IPv4 scope?

The correct answer indicates specific DNS servers that are presumably designated for use within the Sales IPv4 scope. The choice of 198.28.56.108 and 163.128.78.93 suggests that these are public DNS servers, which might be used for ensuring that all devices within the Sales scope have reliable internet resolution capabilities.

In a networking context, particularly when configuring DHCP and DNS settings, it is crucial to provide IP addresses of functioning DNS servers that can resolve domain names into IP addresses. Using well-known public DNS servers can facilitate internet access for the systems within that scope and ensure they can effectively resolve names to IP addresses necessary for web services and other network functionalities.

Since the other options contain IP addresses that may not be configured as public DNS servers or are specific addresses that likely belong to a private network context, they wouldn't be appropriate for general internet use or might not align with the intended network design for the Sales IPv4 scope.