Pls help with this two.

Which of the following is a way the operating system prevents unknown or unauthorized users from accessing the system?

What is a scenario where records stored in a computer frequently need to be checked

Drag the tiles to the correct boxes to complete the pairs. match the errors with their definitions. #name #value #ref when a formula produces output that is too lengthy to fit in the spreadsheet cell arrowright when you enter an invalid cell reference in a formula arrowright when you type text in cells that accept numeric data arrowright when you type in a cell reference that doesn’t exist arrowright reset next