A chocolate-making company makes two types of chocolates. Each batch of white chocolate requires 0.5 hours for blending and 1.5 hours for moulding. Each batch of dark chocolate requires 1.2 hours for blending and 1.8 hours for moulding. The company's blending machine can work for maximum 42 hours in a week, and the moulding machine can work for maximum 35 hours in a week. Let W represent the number of batches of white chocolate that the company can manufacture in a week and D represent the number of batches of dark chocolate that the company can manufacture in a week. Which of the following st

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