stated, \"This compensation plan will be reviewed and potentially amended after one year and will be subject to such review and amendment annually thereafter." Duncan's efforts as EDD were successful, and the bteinesslending program he developed grew to represent 25 percent of Mitsni's business in EDDIE and 41] percent in El. Nevertheless, lvtitsui refused to give Duncan a raise in 21105. in fact, Mitsui amended his compensation plan to reduce his compensation signicantly and to change his performance evaluation schedule to every sitt months. When he had still not received a raise by Hill, Duncan resigned as EDD and filed a lawsuit alleging breach of contract Using the information presented in the chapter, answer the following questions. (Hint; Consult Chapter It] for your answer [Ch. 11 if using 13']: ed.]}|. a. What are the four requirements of a valid contract? b. Did Duncan have a valid contract with ivtitsni for employment as EDD? if so, was it a bilateral or a tn'tilateral contract? c. What are the requinements of an implied contract? d. Can Duncan establish an implied contract based on the employment manual or the written compensation plan? Why or why not