The internet backbone is a foundation network linked with fiber-optic cables that can support very high bandwidth. Fiber-optic cables can be compared with an electrical cable because they use the fibers to carry light and transfer information. The fiber-optics within a network help the information travel through the bandwidths at a fast, clear speed.
The only given option that is a physical security measure is; Passwords
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Computer Security</h3>
Physical security is defined as the protection of personnel, hardware, software, networks or data from the adverse effect of human actions and events. These adverse actions or events could lead to severe loss and damage to an enterprise or any institution or even personnel.
Now, among the given options, firewall is a network security that simply monitors and filters the incoming and outgoing network traffic on a computer.
Anti-virus is uses to detect and remove corrupt files from a computer system. Whereas passwords are physical security measures because they involve human actions.
Read about Computer security at; brainly.com/question/26260220
Answer: Review
Because you want to review the comments
