What is the command to delete the default gateway from the system IP routing table? (Choose TWO correct answers.)

The `route del default` command uses the older `route` utility to remove the default route, effectively deleting the default gateway from the routing table.

`ifconfig` is primarily used for configuring network interfaces, not for directly manipulating routing table entries like deleting a default gateway, and it does not have an 'unset default' option.

`netstat -r` is used to display the routing table, not to modify or delete routes within it.

The `ip route del default` command uses the modern `ip` utility (from the iproute2 suite) to delete the default route, which serves as the default gateway.

`sysctl` is used to modify kernel parameters at runtime, not to directly delete specific routes from the routing table; `ipv4.default_gw` is not a standard sysctl parameter for this purpose.