Final answer:
Guard Dogs are NOT one of the principal security measures that help keep supply chain facilities safe.
Step-by-step explanation:
The security measures mentioned are Alarm Systems, Closed Circuit TV, Guard Dogs, and Gates. Out of these options, Guard Dogs are NOT one of the principal security measures that help keep supply chain facilities safe.
Alarm Systems are commonly used to detect unauthorized access or break-ins. Closed Circuit TV provides surveillance and helps monitor activities in the facility. Gates are used to control access and prevent unauthorized entry. However, Guard Dogs are not typically used as a primary security measure in supply chain facilities.