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Refer to Figure 6.1. Which of the following is definitely true? I. Point A corresponds to a higher total cost and higher production than point B Il. Point A would never be optimal, even if prices were to change Ill. At point C, the firm would incur the same cost as at point D Figure 6.1 50 300 Units of Capital E q4 = 600 93 = 450 92 = 300 q1 150 75 125 Units of Labor O I, II and Ill O I and Ill only O Ill only O I only O II and Ill only O II only O I and II only