Respond to each of the following scenarios, under the provisions of the Contract Act, 1872; While references to sections from the Act are not required, you must use the relevant legal terminology.

Q.1 Alice wrote to Bill offering to sell him a block of shares in Utopia Ltd. In her letter, which arrived on Tuesday, Alice asked Bill to 'let me know by next Saturday'. On Thursday Bill posted a reply accepting the offer. At 6pm on Friday he changed his mind and telephoned Alice. Alice was not there but her telephone answering machine recorded Bill's message stating that he wished to withdraw his acceptance. On Monday Alice opened Bill's letter, which arrived that morning, and then played back the message on the machine. Advise Alice.