State whether the following offers are valid or not. Motivate your answer by referring to the most applicable requirement for a valid offer.

1.1 KFC is a well-known take away restaurant in South Africa, specialized in providing the tastiest and crispiest fried chicken to consumers. Chick-Chick Farm has been the new supplier of fresh chicken pieces to KFC. Chick-Chick Farm sent an offer to KFC stating that they would supply an unspecified amount of chicken to the value of R5 000 000.