QUESTION 19 Typically, contracting parties reach mutual assent using a combination of O A. an invitation to negotiate and an acceptance O B. an offer and promissory estoppel O C. an invitation to negotiate and an offer O D. an offer and an acceptance QUESTION 20 Which of the following provides that the acceptance of an offer is generally effective upon dispatch of the acceptance when sent in a commercially reasonable manner, and not when the acceptance is received by the offeror? O A. The mailbox rule O B. The promissory estoppel doctrine OC. The mirror image rule O D. The commercial dispatch rule QUESTION 21 Which of the following is the legal rule used by courts to protect parties who may lack the ability to understand the terms of an agreement? O A. Capacity OB. Unilateral mistake O C. Consideration O D. Promissory estoppel