What i
s the extention of exel worksheet

.xlsx

Explanation:

In older versions of excel, the extension was .xls

answer is:

a). backstage view

explanation:

backstage view is the area where files and data about them is managed— creating, saving, printing, sending to others, inspecting for hidden metadata or personal information, and setting options. so in this way we can add many things to our document swiftly.

i hope you get the idea.

hey, you need to attach a picture, or type what jobs and qualifications, so i can you