(a) Why is silence not acceptable and what are the exceptions to this rule? (3 marks) (b) Explain the postal rule and state the case which is the authority of this rule. (3 marks) (c) The general rule is that consideration must move from the promisee. Discuss this statement with reference to case law. (3 marks) (d) In what circumstances can it be said that it is not necessary for the offeree to communicate his or her acceptances of the offer. (3 marks) (e) What do you mean by contra proferentem rule and what is the effect of such rule in contract law? Support your answer with case law. (3 marks)