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Which of the following is used to verify if a NIC port can send and receive data?
Correct Answer: A
A loopback plug is used to test the functionality of network interface card (NIC) ports to ensure they can send and receive data. It is a diagnostic tool that loops back the signal to the device, allowing verification of the network port's operation. This aligns with CompTIA Core 1 objectives related to troubleshooting wired and wireless networks and verifying network connectivity.