Back them up on a different drive
Answer:
a. click on View, then ruler
Explanation:
If you want to add ruler to the document following is the procedure to do it:
Click on View.
Then check the ruler in the group called show.
You will get the ruler in your document.You can also remove it by unchecking the ruler box.
Ruler is used to measure and line up objects.
Hence the answer to this question is option A.
