Enter the additional instruction that must be added to the command 'ipconfig' to view all IP settings for a computer:

The command 'ipconfig' is used in Windows operating systems to display the network configuration details of the computer. By adding '/all' to the command, you expand its functionality to not only show the current IP address, subnet mask, and default gateway for each adapter but also to include additional details such as the DNS servers, DHCP status, and other configuration parameters.

Using '/all' allows you to obtain a comprehensive overview of all the network adapters configured on the computer, which is particularly useful for troubleshooting network issues or understanding the network setup. The other options do not provide this level of detail when used with the 'ipconfig' command, making '/all' the correct addition for obtaining complete IP settings.