What are these important features?

To upload data from flat files, SAP HANA offers several features.

What are these important features? There are 2 correct answers to this question
A . The application suggests the column name and data type for the new tables, and it is possible to edit them
B . The supported file types for upload are: .cssv, .xlls, and .xlsxxx
C . The new table always has a 2:2 mapping between the file and table columns
D . When loading new data in the table, it gets appended to the existing data

Answer: A,D