单项选择题
An administrator needs to add fault tolerance capabilities to a server. Which of the following is the BEST solution to accomplish this?（）
A. Move the architecture from 32-bit to 64-bit.
B. Install a PBX card.
C. Install a second NIC card.
D. Install a fail-over cable.
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Which of the following expansion cards would be necessary to increase fault tolerance in a VoIP server?（）
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