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单项选择题

Choose the element that differentiates the Cisco SBCS solution from the competing Avaya IP Office and Nortel BCM 50 solutions.()

A. SBCS providesPoE through a modular upgrade.
B. SBCS supports more analog trunks than the competitors.
C. Only SBCS provides bundled conference calling.
D. Only SBCS provides a wireless option.

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