Please answer all the questions below for a thumbs up$,$ thank you so much :D

$($please include legal justifications in your response!!!$)$

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Make sure to explicitly declare your choices along with the rationale behind them.

For each scenario provided, please articulate your responses and substantiate them with the corresponding legal justifications.

$1.$ Alice calls Bob and offers to sell her laptop computer, named "TechMate," and printer to Bob for $$500.$ She promises to keep the offer open for $30$ days.

$2.$ Alice speaks to Bob and offers to sell her laptop computer, named "Digital Buddy," and printer to Bob for $$500.$ Alice says she will keep the offer open for $30$ days if Bob gives her $$100,$ which he does.

$3.$ Alice sends Bob a letter offering to sell her laptop computer, named "ElectroBook," and printer to Bob for $$500.$ In her letter, Alice states that the offer will expire in $30$ days if she does not hear from Bob in that time.

$4.$ Alice sends Bob a letter offering to sell her laptop computer, named "CyberPal," and printer to Bob for $$500.$ In her letter, Alice states that the offer will not be withdrawn for $30$ days.