A Big Data Processing System Involves Five Layers: Data Collection

A big data processing system involves five layers: data collection, data storage, data processing, data analysis, and data application and presentation. Which of the following statements about the five layers are correct? (Select two)

A) Data collection is implemented based on data sources. Attention must be paid to the use of structured and unstructured database technologies.
B) Data storage resolves the massive data storage issue. Attention must be paid to data variety and heterogeneous data convergence.
C) Data processing features high velocity. Attention must be paid to the parallel computing technology.
D) Data analysis and application highlight data value. Attention must be paid attention to data mining, business intelligence, and data search.