对于执行edu_class变量数据编码和缺失值填充的代码，以下哪个Python代码片段不能正确实现所提供的操作？

A. data_raw[‘gender’] = data_raw[‘gender’].replace({‘Male’: 1, ‘Female’: 0})

B. data_raw[‘edu_class’] = data_raw[‘edu_class’].map(lambda x: label.index(x) if x in label else len(label))

C. data_raw[‘edu_class’] = data_raw[‘edu_class’].apply(lambda x: label.index(x) if pd.notnull(x) else len(label))

D. data_raw[‘edu_class’] = data_raw[‘edu_class’].apply(lambda x: label.index(x) if x in label else -1)

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