You are a help desk trainee for YourDomain.com. You have been assigned the task to develop VoIP business, and received the feedback from a Telecommunications manager that he doubts about the speech quality of VoIP is not good and he would rather wait until the technology has really been tested.
What is the best explanation to persuade the telecommunications manager to implement a Cisco Unified Communications solution?

A.
Today, the Internet has enough bandwidth, and it can guarantee the QoS for speech.

B.
Cisco Unified Communications is the higher state of VoIP, so it offers better quality.

C.
VoIP is already a proven technology and the speech quality would be as good as, if not better than, a traditional phone system.

D.
Policies applied to traffic on a Cisco Unified Communications network are set to give a higher priority to voice packets than to data packets, which guarantees that speech quality is as good as, if not better than, a traditional phone system.