A user notices that the data transfer rate for the gigabit NIC in the user computer is much slower than expected. What is a possible cause for the problem?

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Question:
A user notices that the data transfer rate for the gigabit NIC in the user computer is much slower than expected. What is a possible cause for the problem?

The NIC duplex settings have somehow been set to half-duplex.
The NIC wake-on-LAN setting is misconfigured.
Hibernation mode is causing the NIC to shutdown unexpectedly.
The NIC is configured to use both IPv4 and IPv6 at the same time.

Exam with this question: IT Essentials (ITE v7) Chapter 8 Exam Answers