Answer :
Final answer:
Installing USB port blockers is the best example of a cost-effective physical control to enforce a USB removable media restriction.
Explanation:
The best example of a cost-effective physical control to enforce a USB removable media restriction would be installing USB port blockers. USB port blockers prevent unauthorized use of USB devices by physically blocking access to the USB ports on a computer or device.
Educating employees about USB security is important, but it is not a physical control. It is an important measure to create awareness about USB security practices.
Using USB access control software can also be effective, but it may involve additional costs and require regular updates to prevent newer forms of USB attacks.
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