What should a report author do to use data from two tabs of an Excel file (.xlsx) together in a single object in a Dashboard?

What should a report author do to use data from two tabs of an Excel file (.xlsx) together in a single object in a Dashboard?
A . Upload each tab as one upload file and merge together within a data module.
B . Upload each tab as separate upload files and merge together within a data module.
C . Create separate Excel files for each tab, upload the files as one upload file and merge together within a data module.
D . Create separate Excel files for each tab, upload the files as separate upload files and merge together within a data module.

Answer: D