The processing in the ____ tier ensures that valid data is entered into the program for processing in the business tier.

The Windows ________ utility rearranges fragmented files on a hard drive in order to improve efficiency

A) Check Disk B) Optimize Drives C) Error Checking D) Disk Cleanup

The ________ add-in can be used to analyze and review workbooks and uncover problems such as formula errors

Fill in the blank(s) with the appropriate word(s).