(b) After this case, Phillis has noticed the importance of HK law. She attended a conference on HK Legal system, Contract law and Employment Law. She has some questions on the following issues and wants to seek your advice on the following matters: i) What are the differences between law and ethics? ii) The speakers at the conference talked about one of the basic rules of Contract named "postal rule". Phillis was not clear about the concept. What is Postal Rule? Can you explain the exceptions of Postal Rule to her?