IBM 000-151 exam question

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QUESTION
A retail customer installs a BladeCenter into an existing 10/100 Ethernet network. Due to cost considerations, the customer uses Copper Pass-thru Modules. After installing this solution, the customer finds that they have no network connectivity. Which of the following at is causing the problem?
A. Copper Pass-thru Modules only support 1000Mb line speeds.
B. Spanning Tree has been enabled on the Copper Pass-thru Module.
C. The customer does not have the latest firmware loaded on the Copper Pass-thru Module.
D. The customer is using LS21 Blades
Answer: A