Barbaro, You did good, it's the second one down. Here's the example, smoke alarm right? Family live in the house and some went out for the evening. Suddenly the house was on fire due to faulty repair on electrical systems day before. One person died in the house. Firefighter put the fire out and found no smoke alarm in the house. Now who's responsible for death in a family, electrical repairman? or Family (because they ignore not having smoke alarm in the house)? So same thing with Deaf woman ignore of not having doorbell signaler installed. She neglected it. Contractors did tried to knock on the door and no response at all. So Contractor had to start working on the roof because time is money...you know? They have very busy schedule and no room for error. Finally, it's not about the wrong address, Contractor did tried to knock on the door to verify if they got the right address, hence, no one answered.