Given the expression a + b. What type of expression is this?

If you forget to save a document after you have edited it, when you attempt to close it, a dialog box will be displayed asking if you want to save your changes.

Answer the following statement true (T) or false (F)

In a file listing, the 9 characters following the file type (for example, -rwxr-xr-x) refer to the file's _________________________.

Fill in the blank(s) with the appropriate word(s).