Which of the following would not be generally effective upon receipt? (Choose all of the correct answers.) D A rejection of an offer D A counter-offer D An acceptance of an offer with minor changes D An offer which is conditions its acceptance to be upon receipt D An acceptance of an offer Which of the following would be generally effective upon receipt? (Choose all of the correct answers.) [I Making of an offer CI Rejection of an offer [I Acceptance of an offer [I Revocation of an offer [I Acceptance of an offer with minor changes Generally, a court will use the theory of promissory estoppel: (Choose all of the correct answers.) [I When a valid contract does not exist [I If at least one of the parties cannot read or write [I Only when the amount at issue is greater than $500 CI To enforce a promise made by one party which is relied upon by another party, even if the promise involved illegal activity [I To prevent one of the parties from being unjustly enriched