Mike has implemented an IP telephony system for his company. Employees now use this system for their telephone calls. Which of the following is true regarding Voice-over-IP (VoIP) telephone conversations?

A.
A packet-based network is used to convey the conversations.

B.
A dedicated, circuit-based network is used to convey the conversations-

C.
The conversations use wired networks, not wireless transmission media.

D.
The conversations use wireless transmission media, not wired networks.