Can you please answer the questions computer subject

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

The blank button automatically displays next to the data when you select a range of numeric data which is an available option for creating a chart

Use the keyword strategy to remember the meaning of the following word. the meaning for the word has been provided. write your keyword and describe the picture you would create in your mind. obfuscate: to make something so confusing that it is difficult to understand.