What is ding dong to the wall

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

Dean wants a quick way to look up staff members by their staff id. in cell q3, nest the existing vlookup function in an iferror function. if the vlookup function returns an error result, the text “invalid staff id” should be displayed by the formula. (hint: you can test that this formula is working by changing the value in cell q2 to 0, but remember to set the value of cell q2 back to 1036 when the testing is complete.)

Which text function capitalizes the first letter in a string of text? question 10 options: upper capital first proper