please i need clear answer

2. Using the appropriate command, explain how to solve the following situations: (enclose the print screen of your effort) a. to combine "quiz1.xls", "quiz2.xls" and "quiz3.xls" into one file named "report.xls" in the current directory. b. to combine all files in the current directory on the current drive that have the extension ".xls" into one file named "combined.xls" c. to combine first all files with the ".txt" extension, then all files with the ".doc" extension and all files with the .xls extension into one file named "combine.doc"