Bruce and Stella met at a comic book convention in Australia on the 4th of February. Stella was looking for rare comic books to sell in her comic book store. Bruce was selling comic books.

Stella was very interested in one of the comic books offered for sale by Bruce, called "Mightymouse #42". However, Stella wanted to ask some questions about its history.

Bruce became tired of talking to Stella and said, "Here's my offer to you. I'll sell you the Mightymouse for $3,000." Stella then responded, "Well, I do like the comic book. Does it include a certificate of authenticity?" Bruce replied, "Yes, it does." Stella then asked "What kind of picture frame will you include? Can you supply an oak wood frame?" Bruce replied "No. The comic book is only supplied with a standard picture frame of pine timber"

Stella did like the comic book, but could not decide whether to buy it or not. She asked Bruce if he would keep his offer open for the next 3 days. Bruce said that he would keep it open for 2 days, which was the end of the convention. He promised to keep the offer available to Stella until 4 pm on the 6th of February. Bruce gave Stella his business card, and asked her to contact him at the email address on the card.

On the 6th of February, Stella made up her mind and decided to buy the Mightymouse comic book. At 12 noon she emailed Bruce stating, "I accept your offer to sell the Mightymouse #42 for $3,000, including a standard picture frame." The email appeared in Bruce's inbox moments later, but Bruce was busy at the convention and did not read it until he returned home at the conclusion of the convention. At 1:30pm on 6th February, Bruce telephoned Stella to tell her that he was cancelling his offer. Stella would still like to buy the comic book. She asks your advice.

(a) what's the legal arguments of the defendant ( bruce) and the legal arguments of the plaintiff (stella) on this scenario and the explanation of each legal principles and its source in law.