Tieng operates a webstore selling consumer electronics, including tablets. On 31 May, she advertises an end of financial year sale' via social media, email newsletters, and her website. The sale advertisements include the new Orange iTablet, for a special introductory price of $599 (rather than $799), 'available to the first twenty customers placing webstore orders after 12:01 AM on 14 June'. On 7 June, Tieng changes her mind about the discount, but doesn't change her advertisements. On 14 June, she charges all customers (including the first twenty) the regular $799 price for the Orange iTablet. Nisha, who placed the first order in the webstore at 12:05AM on 14 June, is unhappy about being charged full price. She complains, and argues that Tieng is legally required to sell her an Orange iTablet for $599. Is Tieng required to sell Nisha an Orange iTablet for $599, according to the law of contract? Please refer to any relevant legal cases and/or legislation to support your arguments, and ensure that you fully explain your answer. Do not discuss the Australian Consumer Law for the purposes of answering this question. Type your answer in the box below. (3 marks.)