Austin's black German Shepherd, Sheba, gave birth to five puppies three months ago. He planned to sell each puppy for $5,000. He placed an advertisement in the newspapers. His 25-year-old nephew, Tim, saw the advertisement and immediately called Austin to say that he would like to see the puppies before deciding on whether or not to purchase one. Austin told him to come to his house that evening. After viewing the puppies, Tim asked Austin if he would consider selling one of the puppies for $2,500. Austin said that he would not sell any puppy for less than $5,000 as they were thoroughbred puppies. Tim said he needed a day to consider Austin's price. Austin told him that if he agreed to buy a puppy, he should send him a WhatzApp message within the next two days. The next day, Tim sent Austin an email saying that he would purchase one of the puppies for $5,000. However, Austin seldom checks his email or even uses his laptop, and thus never sees Tim's email. After the second day, when Austin received no WhatzApp message from Tim, Austin sold all five puppies to neighbours for $5,000 each. When Tim came by to Austin's house to collect and pay for one of the puppies, he was surprised to hear that Austin had sold all of them off. Required: Discuss the legal positions of Austin and Tim under contract law.