Which of the following is not a way to filter data while reading?

• A. Specifying features to read.
• B. Deleting parts of your source data you don't need.
• C. Specifying a search envelope.
• D. Using a WHERE clause (format permitting).

Answer: (B)

Filtering data at read time means controlling exactly what the reader pulls from the source, so only the needed features and data are brought into the workspace. The options that accomplish this directly are: choosing which features to read, applying a geographic constraint through a search envelope, and using a WHERE clause to limit features by attributes when the format supports it. Deleting parts of the source data you don’t need happens after the data has been read (or as a separate operation on the source), not during the read step, so it isn’t a read-time filter. It effectively alters the data post-read rather than preventing unwanted data from being read in the first place.