Help plz

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

How can a user open a blank presentation? 1.on the file menu, click new, and then click recent templates 2.on the file menu, click new, and then click blank presentation 3. on the view menu, click templates, and then click recent templates 4. on the view menu, click samples, and then click blank presentation

Look at the far left lane in the picture. explain what the red car is doing and what it needs to do to travel safely.