Which of the following statements about a pastry chef is INCORRECT？A．His salary is gradual

Which of the following statements about a pastry chef is INCORRECT？

A．His salary is gradually raised every year.

B．He had at least 150 hours of training.

C．His median pay is the highest on the list.

D．He must have employees working for him.

请帮忙给出正确答案和分析，谢谢！