Which of the following is not a valid way to read multiple datasets from a single reader?

• A. Wildcard expressions in the Source Dataset parameter
• B. Select Multiple Folders/Files in the File Browser dropdown
• C. Ctrl+ or Shift+click on Windows (or Cmd+ or Shift+click on Mac) when using the File Browser.
• D. All of the above

Answer: (D)

The ability to read multiple datasets from one reader isn’t achieved by just listing several inputs in the reader’s configuration. A single reader instance is intended to process one dataset reference per run. Even though wildcard expressions or selecting multiple files in the UI might seem to point to several inputs, they don’t reliably configure the reader to ingest multiple datasets in one pass, and in many cases aren’t supported to do so. To handle multiple datasets, you’d typically use separate readers or a workflow mechanism that iterates over a list of datasets rather than trying to feed multiple datasets into a single reader instance. Because none of these methods provides a guaranteed, single-reader multi-dataset input, all of the above are not valid standalone ways to read multiple datasets from a single reader.