【单选题】
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.
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