Final answer:
The question pertains to applying red solid fill data bar conditional formatting in a spreadsheet range D21:H27, which is a task related to the use of spreadsheet software under the category of Computers and Technology.
Step-by-step explanation:
The student's question regarding the application of red solid fill data bar conditional formatting to certain cells in a Time Card worksheet falls under the category of Computers and Technology, which often includes instructions for using software such as spreadsheet programs.
To apply this conditional formatting in a program like Microsoft Excel, you need to highlight the range of cells mentioned (D21:H27), then navigate to the 'Conditional Formatting' options in the Home tab. From there, choose 'Data Bars' and select the solid red fill option to apply it to the selected cells. This visual tool helps in quickly analyzing data by filling the cells with a length of color proportionate to the cell's value in relation to the other cells in the range.