Nelly owns a house that sits on two acres of land. Professionally, Nelly is a chiropractor who regularly meets with her patients at the house. Although the house has a very nice front door, Nelly's patients and houseguests usually enter the house through a side door near the garage. Between the garage and this side door, there is a small decorative pool with goldfish in it, but this pool is hidden behind some overgrown bushes making it difficult for people to notice it. In order to prevent people from accidentally falling into this pool, Nelly has placed a warning sign near the bushes alerting people to be mindful of the hidden pool when approaching the house. One day, Jon came onto Nelly's property. Jon took notice of the warning sign, but he ignored it. Unfortunately, Jon fell into the pool and broke his arm.

(a) If Jon is one of Nelly's patients who came onto Nelly's property for a pre-scheduled appointment, is Nelly liable for Jon's injury? Briefly explain your answer.

(b) If Jon is Nelly's ex-boyfriend who came onto Nelly's property unannounced to beg for her to take him back, is Nelly liable for Jon's injury? Briefly explain your answer.

(c) If Jon is Nelly's brother who was invited to came onto Nelly's property to have lunch with his sister, is Nelly liable for Jon's injury? Briefly explain your answer.

(d) If Jon is the five year old boy who lives next door that came onto Nelly's property to play with the goldfish, is Nelly liable for Jon's injury? Briefly explain your answer.