Which of the following is an example of the preexisting duty rule?

Multiple Choice

• Kristi was sitting at a bus stop when she saw Tim absent mindedly walking into traffic. She warned Tim, and he stepped back just in time. Tim offered Kristi $1,000 in consideration.
• Aubrey entered into an agreement with Ping in which Aubrey would deliver the computers that Ping made in consideration of $25 per delivery.
• Deputy Kelly entered into a written agreement with Babe in which Kelly agreed to find the person who stole Babe's skateboard in consideration of $100.
• All of the hypotheticals are examples of the preexisting duty rule.