When considering the three VoIP design models – single site, centralized multisite, and distributed multisite – which question below would help to eliminate one of the options?

When considering the three VoIP design models – single site, centralized multisite, and distributed multisite – which question below would help to eliminate one of the options?
A . Will the switches be required to provide inline power?
B . Will users need to make offsite calls, beyond the enterprise?
C . Will users require applications such as voice mail and interactive voice response?
D . Are there users whose only enterprise access is via a QoS-enabled WAN?

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Answer: D