I.On October 1, Pam, a stockbroker, sent a signed letter to Mark offering to her old iPhone for $400.In the letter, which accurately described the phone and indicated the price, Pam wrote: "I promise to keep this firm offer open to you for 4 months from today.(signed) Pam."On January 15, Pam decided she did not want to sell the phone anymore.On that same day, Pam sent a letter to Mark telling him that the October 1 offer was no longer open to him.Mark received the letter on January 17.On January 18, Mark sent a letter to Pam saying, "I accept your offer of October 1."Pam received the letter on February 2.Pam refused to deliver the iPhone to Mark.Mark sued Pam for breach of contract.

1.Judgment for whom?Explain fully.

2.Suppose Pam is a smartphone salesman instead of a stockbroker.Would your answer to part 1 change?Explain fully.

3. Suppose that Mark's letter read as follows: "I accept your offer of October 1 provided that you also include a phone case."Assuming that Pam's offer is valid, is Mark's acceptance valid?Explain fully.

Please answer #1&2 with 2 IRACS, and #3 with 1 IRAC! thank you!