A network technician is examining a switch running Rapid PVST+. On interface GigabitEthernet0/2, the switch has determined this is a non-designated port that provides an alternate path to the root bridge. Because a better path already exists through the root port, this interface is not forwarding frames but is ready to take over quickly if the primary path fails. Which port state is interface GigabitEthernet0/2 currently in?