Which of the following is true of data understanding and data preparation? A. Data preparation often occurs right after data understanding. B. Characteristics of attributes and the dependencies between attributes are recognized in data preparation. C. Data preparation provides information about the data, which will be used in data understanding. D. Generally, data preparation takes much less time than data understanding. E. Data cleansing, selection, and transformation are included in data preparation, while data integration is included in data understanding.