I don't like the idea of an alert system. You would never be able to surprise attack someone. If you pay attention you can get a feel for when someone is online or not. If an alert is added people will be able to move defenses around defeating the attack before it even starts.
People are already complaining defense is over powered and this will tip the scales further into defenses favor. If you want to know if your being attacked just check in more often.
This is a very complex book with lots of underlying themes. Since the main character dies despite its pride and perseverance the correct answer is B. The Nature is a powerful force and should be given great respect and also C. Humans can learn a great deal from animals around them, since the main character learns a lot from a wolf. Almost all of the London's stories about the Great North serve to show that there is something greater than us, that the nature will ultimately win because we do not know how to play by it's rules yet.
