A user has a 1TB external hard drive connected to a desktop system. When the user searches the drive for a file, the response to the search is very slow. How can the user improve the performance of the file searches on the external drive?（）

• A、Change the sort order of the files.
• B、Make sure that all of the files are in folders that are in alphabetical order.
• C、Search multiple drive letters at the same time.
• D、Turn on indexing for the assigned drive letter.