Identify measures to protect your computer against threats from human actions. You cannot access a file in a computer that belongs to your friend. What prevents you from accessing the file?

Firewalls

Explanation:

A firewall is simply a network security system whose main duty is. to prevent unwanted access to. private network.

Firewalls is measures to protect your computer against threats from human actions.

It is also the one singular thing that prevents you from accessing the file on your friends system.