The file extension that can be used to save the worksheets is Templates because he needs to save them with the .xlts extension.
This refers to where information is stored and contains a database with data and parameters.
Hence, we can see that because Aslam wants to make multiple worksheets that have a common formatting style for his team members, he would need to use templates that save with the .xlts extension.
Read more about worksheets here:
https://brainly.com/question/5032731
#SPJ4